Reading a video on GPU using C++ and CUDA - c++

Question

Hi everyone and thanks for your answers
First of all is, as #zkoza and #talonmies pointed it out, Jetson AGX Xavier are compatible with ARCH 7.2 and not ARCH 5.3 which was used in Jetson Nano's case.
To #Yunus Temurlenk => the fname in my code is only myvideo.MOV since i execute my code in the same repertory of the movie, i also tried with a .mp4 file got from sample in internet resulting the same error.
Yes as you pointed out my NVCUVID is not ON after the cmake command as you can see in my original post the line corresponding to CUDA is
NVIDIA CUDA: YES (ver 10.2, CUFFT CUBLAS FAST_MATH)
and not
NVIDIA CUDA: YES (ver 10.2, CUFFT NVCUVID CUBLAS FAST_MATH)
I don't know which dependencies are missing but i also saw here that NVCUVID was deprecated : https://docs.nvidia.com/cuda/video-decoder/index.html
The example from step 6 of cuda works fine :)
I'm currently making opencv 4.3.0 with cuda 10.2 I will update my answer if this solve my problem.
EDIT : Unfortunately the problem is exactly the same using openCV 4.3.0 and Cuda 10.2 on Ubuntu 18.04, but i wanted to add that I compiling with this command :
g++ video_reader.cpp -o vr.exe `pkg-config --cflags --libs opencv4`
since g++ by itself give me this error :
video_reader.cpp:3:10: fatal error: opencv2/opencv_modules.hpp: No such file or directory
#include "opencv2/opencv_modules.hpp"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
So, maybe my compilation command is the problem ?
END EDIT
To #user2986898 and #einpoklum => i ran cv::getBuildInformation() and 2 other functions : the number of device(s) and the number of device(s) compatible(s). The number of device and compatible device was 1 as expected and the build information are :
General configuration for OpenCV 4.5.1 =====================================
Version control: unknown
Extra modules:
Location (extra): /home/dronemaitre/Documents/opencv_cpp/opencv_contrib/modules
Version control (extra): unknown
Platform:
Timestamp: 2021-01-18T10:12:44Z
Host: Linux 4.9.140-tegra aarch64
CMake: 3.10.2
CMake generator: Unix Makefiles
CMake build tool: /usr/bin/make
Configuration: RELEASE
CPU/HW features:
Baseline: NEON FP16
C/C++:
Built as dynamic libs?: YES
C++ standard: 11
C++ Compiler: /usr/bin/c++ (ver 7.5.0)
C++ flags (Release): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG
C Compiler: /usr/bin/cc
C flags (Release): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fsigned-char -ffast-math -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed
Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed
ccache: NO
Precompiled headers: NO
Extra dependencies: m pthread /usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so cudart_static dl rt nppc nppial nppicc nppicom nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda-10.2/lib64 -L/usr/lib/aarch64-linux-gnu
3rdparty dependencies:
OpenCV modules:
To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot python2 python3 quality rapid reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto
Disabled: world
Disabled by dependency: -
Unavailable: cnn_3dobj java julia matlab ovis viz
Applications: tests perf_tests apps
Documentation: NO
Non-free algorithms: NO
GUI:
QT: YES (ver 5.9.5)
QT OpenGL support: YES (Qt5::OpenGL 5.9.5)
GTK+: NO
OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so)
VTK support: NO
Media I/O:
ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11)
JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 80)
WEBP: build (ver encoder: 0x020f)
PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.34)
TIFF: /usr/lib/aarch64-linux-gnu/libtiff.so (ver 42 / 4.0.9)
JPEG 2000: build (ver 2.3.1)
OpenEXR: build (ver 2.3.0)
HDR: YES
SUNRASTER: YES
PXM: YES
PFM: YES
Video I/O:
DC1394: YES (2.2.5)
FFMPEG: YES
avcodec: YES (57.107.100)
avformat: YES (57.83.100)
avutil: YES (55.78.100)
swscale: YES (4.8.100)
avresample: YES (3.7.0)
GStreamer: YES (1.14.5)
v4l/v4l2: YES (linux/videodev2.h)
Parallel framework: TBB (ver 2017.0 interface 9107)
Trace: YES (with Intel ITT)
Other third-party libraries:
Lapack: NO
Eigen: YES (ver 3.3.4)
Custom HAL: YES (carotene (ver 0.0.1))
Protobuf: build (3.5.1)
NVIDIA CUDA: YES (ver 10.2, CUFFT CUBLAS FAST_MATH)
NVIDIA GPU arch: 72
NVIDIA PTX archs:
cuDNN: YES (ver 8.0.0)
OpenCL: YES (no extra features)
Include path: /home/dronemaitre/Documents/opencv_cpp/opencv/3rdparty/include/opencl/1.2
Link libraries: Dynamic load
Python 2:
Interpreter: /usr/bin/python2.7 (ver 2.7.17)
Libraries: /usr/lib/aarch64-linux-gnu/libpython2.7.so (ver 2.7.17)
numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.13.3)
install path: lib/python2.7/dist-packages/cv2/python-2.7
Python 3:
Interpreter: /usr/bin/python3 (ver 3.6.9)
Libraries: /usr/lib/aarch64-linux-gnu/libpython3.6m.so (ver 3.6.9)
numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.13.3)
install path: lib/python3.6/dist-packages/cv2/python-3.6
Python (for build): /usr/bin/python2.7
Java:
ant: NO
JNI: NO
Java wrappers: NO
Java tests: NO
Install to: /usr/local
-----------------------------------------------------------------
It seems Cuda is found by OpenCV but again here we can see that NVCUVID is not added even so i put -D NVCUVID=ON as you said it might be ignored because not compatible with my config.
EDIT : ccmake command ran in my build folder gives me this output :
ANT_EXECUTABLE ANT_EXECUTABLE-NOTFOUND
Atlas_BLAS_LIBRARY /usr/lib/aarch64-linux-gnu/libatlas.so
Atlas_CBLAS_INCLUDE_DIR /usr/include/aarch64-linux-gnu
Atlas_CBLAS_LIBRARY /usr/lib/aarch64-linux-gnu/libcblas.so
Atlas_CLAPACK_INCLUDE_DIR Atlas_CLAPACK_INCLUDE_DIR-NOTFOUND
Atlas_LAPACK_LIBRARY /usr/lib/aarch64-linux-gnu/liblapack.so
BUILD_CUDA_STUBS OFF
BUILD_DOCS OFF
BUILD_EXAMPLES OFF
BUILD_ITT ON
BUILD_JASPER OFF
BUILD_JAVA ON
BUILD_JPEG OFF
BUILD_LIST
BUILD_OPENEXR OFF
BUILD_PACKAGE ON
BUILD_PERF_TESTS ON
BUILD_PNG OFF
BUILD_PROTOBUF ON
BUILD_SHARED_LIBS ON
BUILD_TBB OFF
BUILD_TESTS ON
BUILD_TIFF OFF
BUILD_USE_SYMLINKS OFF
BUILD_WEBP OFF
BUILD_WITH_DEBUG_INFO OFF
BUILD_WITH_DYNAMIC_IPP OFF
BUILD_ZLIB OFF
BUILD_opencv_alphamat ON
BUILD_opencv_apps ON
BUILD_opencv_aruco ON
BUILD_opencv_bgsegm ON
BUILD_opencv_bioinspired ON
BUILD_opencv_calib3d ON
BUILD_opencv_ccalib ON
BUILD_opencv_core ON
BUILD_opencv_cudaarithm ON
BUILD_opencv_cudabgsegm ON
BUILD_opencv_cudacodec ON
BUILD_opencv_cudafeatures2d ON
BUILD_opencv_cudafilters ON
BUILD_opencv_cudaimgproc ON
BUILD_opencv_cudalegacy ON
BUILD_opencv_cudaobjdetect ON
BUILD_opencv_cudaoptflow ON
BUILD_opencv_cudastereo ON
BUILD_opencv_cudawarping ON
BUILD_opencv_cudev ON
BUILD_opencv_cvv ON
BUILD_opencv_datasets ON
BUILD_opencv_dnn ON
BUILD_opencv_dnn_objdetect ON
BUILD_opencv_dnn_superres ON
BUILD_opencv_dpm ON
BUILD_opencv_face ON
BUILD_opencv_features2d ON
BUILD_opencv_flann ON
BUILD_opencv_freetype ON
BUILD_opencv_fuzzy ON
BUILD_opencv_gapi ON
BUILD_opencv_hdf ON
BUILD_opencv_hfs ON
BUILD_opencv_highgui ON
BUILD_opencv_img_hash ON
BUILD_opencv_imgcodecs ON
BUILD_opencv_imgproc ON
BUILD_opencv_intensity_transfo ON
BUILD_opencv_java_bindings_gen ON
BUILD_opencv_js OFF
BUILD_opencv_line_descriptor ON
BUILD_opencv_ml ON
BUILD_opencv_objdetect ON
BUILD_opencv_optflow ON
BUILD_opencv_phase_unwrapping ON
BUILD_opencv_photo ON
BUILD_opencv_plot ON
BUILD_opencv_python2 ON
BUILD_opencv_python3 ON
BUILD_opencv_python_bindings_g ON
BUILD_opencv_python_tests ON
BUILD_opencv_quality ON
BUILD_opencv_rapid ON
BUILD_opencv_reg ON
BUILD_opencv_rgbd ON
BUILD_opencv_saliency ON
BUILD_opencv_sfm ON
BUILD_opencv_shape ON
BUILD_opencv_stereo ON
BUILD_opencv_stitching ON
BUILD_opencv_structured_light ON
BUILD_opencv_superres ON
BUILD_opencv_surface_matching ON
BUILD_opencv_text ON
BUILD_opencv_tracking ON
BUILD_opencv_ts ON
BUILD_opencv_video ON
BUILD_opencv_videoio ON
BUILD_opencv_videostab ON
BUILD_opencv_world OFF
BUILD_opencv_xfeatures2d ON
BUILD_opencv_ximgproc ON
BUILD_opencv_xobjdetect ON
BUILD_opencv_xphoto ON
CAROTENE_NS carotene_o4t
CCACHE_PROGRAM CCACHE_PROGRAM-NOTFOUND
CLAMDBLAS_INCLUDE_DIR CLAMDBLAS_INCLUDE_DIR-NOTFOUND
CLAMDBLAS_ROOT_DIR CLAMDBLAS_ROOT_DIR-NOTFOUND
CLAMDFFT_INCLUDE_DIR CLAMDFFT_INCLUDE_DIR-NOTFOUND
CLAMDFFT_ROOT_DIR CLAMDFFT_ROOT_DIR-NOTFOUND
CMAKE_BUILD_TYPE RELEASE
CMAKE_CONFIGURATION_TYPES Debug;Release
CMAKE_INSTALL_PREFIX /usr/local
CPU_BASELINE NEON;FP16
CPU_BASELINE_DISABLE ;VFPV3
CPU_BASELINE_REQUIRE ;NEON
CPU_DISPATCH
CUDA_ARCH_BIN 7.2
CUDA_ARCH_PTX
CUDA_FAST_MATH ON
CUDA_GENERATION
CUDA_HOST_COMPILER /usr/bin/cc
CUDA_TOOLKIT_ROOT_DIR /usr/local/cuda-10.2
CUDA_USE_STATIC_CUDA_RUNTIME ON
CUDA_rt_LIBRARY /usr/lib/aarch64-linux-gnu/librt.so
CV_DISABLE_OPTIMIZATION OFF
CV_ENABLE_INTRINSICS ON
CV_TRACE ON
Caffe_INCLUDE_DIR Caffe_INCLUDE_DIR-NOTFOUND
Caffe_LIBS Caffe_LIBS-NOTFOUND
Ceres_DIR Ceres_DIR-NOTFOUND
ENABLE_BUILD_HARDENING OFF
ENABLE_CCACHE ON
ENABLE_CONFIG_VERIFICATION OFF
ENABLE_COVERAGE OFF
ENABLE_FAST_MATH ON
ENABLE_FLAKE8 OFF
ENABLE_GNU_STL_DEBUG OFF
ENABLE_IMPL_COLLECTION OFF
ENABLE_INSTRUMENTATION OFF
ENABLE_LTO OFF
ENABLE_NEON ON
ENABLE_NOISY_WARNINGS OFF
ENABLE_OMIT_FRAME_POINTER ON
ENABLE_PIC ON
ENABLE_PRECOMPILED_HEADERS OFF
ENABLE_PROFILING OFF
ENABLE_PYLINT OFF
ENABLE_SOLUTION_FOLDERS OFF
ENABLE_VFPV3 OFF
EXECUTABLE_OUTPUT_PATH /home/dronemaitre/Documents/opencv_cpp/opencv/build/bin
Eigen3_DIR /usr/lib/cmake/eigen3
GENERATE_ABI_DESCRIPTOR OFF
Glog_LIBS /usr/lib/aarch64-linux-gnu/libglog.so
HDF5_C_LIBRARY_dl /usr/lib/aarch64-linux-gnu/libdl.so
HDF5_C_LIBRARY_hdf5 /usr/lib/aarch64-linux-gnu/hdf5/serial/libhdf5.so
HDF5_C_LIBRARY_m /usr/lib/aarch64-linux-gnu/libm.so
HDF5_C_LIBRARY_pthread /usr/lib/aarch64-linux-gnu/libpthread.so
HDF5_C_LIBRARY_sz /usr/lib/aarch64-linux-gnu/libsz.so
HDF5_C_LIBRARY_z /usr/lib/aarch64-linux-gnu/libz.so
INSTALL_CREATE_DISTRIB OFF
INSTALL_C_EXAMPLES OFF
INSTALL_PYTHON_EXAMPLES OFF
INSTALL_TESTS OFF
INSTALL_TO_MANGLED_PATHS OFF
LAPACKE_INCLUDE_DIR LAPACKE_INCLUDE_DIR-NOTFOUND
LAPACK_CBLAS_H
LAPACK_IMPL Unknown
LAPACK_INCLUDE_DIR
LAPACK_LAPACKE_H
LAPACK_LIBRARIES
Lept_LIBRARY Lept_LIBRARY-NOTFOUND
MKL_INCLUDE_DIRS MKL_ROOT_DIR-NOTFOUND/include
MKL_LAPACKE_INCLUDE_DIR MKL_LAPACKE_INCLUDE_DIR-NOTFOUND
MKL_ROOT_DIR MKL_ROOT_DIR-NOTFOUND
MKL_WITH_OPENMP OFF
MKL_WITH_TBB OFF
OGRE_DIR OGRE_DIR-NOTFOUND
OPENCL_FOUND ON
OPENCV_CONFIG_FILE_INCLUDE_DIR /home/dronemaitre/Documents/opencv_cpp/opencv/build
OPENCV_DNN_CUDA OFF
OPENCV_DNN_OPENCL ON
OPENCV_DOWNLOAD_PATH /home/dronemaitre/Documents/opencv_cpp/opencv/.cache
OPENCV_DUMP_HOOKS_FLOW OFF
OPENCV_ENABLE_ALLOCATOR_STATS ON
OPENCV_ENABLE_ATOMIC_LONG_LONG OFF
OPENCV_ENABLE_MEMALIGN ON
OPENCV_ENABLE_MEMORY_SANITIZER OFF
OPENCV_ENABLE_NONFREE OFF
OPENCV_EXTRA_MODULES_PATH /home/dronemaitre/Documents/opencv_cpp/opencv_contrib/modules
OPENCV_FORCE_3RDPARTY_BUILD OFF
OPENCV_FORCE_PYTHON_LIBS OFF
OPENCV_GENERATE_PKGCONFIG ON
OPENCV_GENERATE_SETUPVARS ON
OPENCV_JAVA_SOURCE_VERSION
OPENCV_JAVA_TARGET_VERSION
OPENCV_MATHJAX_RELPATH https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0
OPENCV_PYTHON3_VERSION OFF
OPENCV_TIMESTAMP 2021-01-18T12:55:10Z
OPENCV_WARNINGS_ARE_ERRORS OFF
OPENEXR_INCLUDE_PATH OPENEXR_INCLUDE_PATH-NOTFOUND
OpenCV_HAL_DIR OpenCV_HAL_DIR-NOTFOUND
OpenJPEG_DIR OpenJPEG_DIR-NOTFOUND
PROTOBUF_UPDATE_FILES OFF
PYTHON2_EXECUTABLE /usr/bin/python2.7
PYTHON2_INCLUDE_DIR /usr/include/python2.7
PYTHON2_INCLUDE_DIR2
PYTHON2_LIBRARY /usr/lib/aarch64-linux-gnu/libpython2.7.so
PYTHON2_LIBRARY_DEBUG
PYTHON2_NUMPY_INCLUDE_DIRS /usr/lib/python2.7/dist-packages/numpy/core/include
PYTHON2_PACKAGES_PATH lib/python2.7/dist-packages
PYTHON3_EXECUTABLE /usr/bin/python3
PYTHON3_INCLUDE_DIR /usr/include/python3.6m
PYTHON3_INCLUDE_DIR2
PYTHON3_LIBRARY /usr/lib/aarch64-linux-gnu/libpython3.6m.so
PYTHON3_LIBRARY_DEBUG
PYTHON3_NUMPY_INCLUDE_DIRS /usr/lib/python3/dist-packages/numpy/core/include
PYTHON3_PACKAGES_PATH lib/python3.6/dist-packages
Qt5Concurrent_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5Concurrent
Qt5Core_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5Core
Qt5Gui_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5Gui
Qt5OpenGL_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5OpenGL
Qt5Test_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5Test
Qt5Widgets_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5Widgets
Qt5_DIR /usr/lib/aarch64-linux-gnu/cmake/Qt5
TBB_DIR TBB_DIR-NOTFOUND
TBB_ENV_INCLUDE /usr/include
TBB_ENV_LIB /usr/lib/aarch64-linux-gnu/libtbb.so
TBB_ENV_LIB_DEBUG TBB_ENV_LIB_DEBUG-NOTFOUND
TBB_VER_FILE /usr/include/tbb/tbb_stddef.h
Tesseract_DIR Tesseract_DIR-NOTFOUND
Tesseract_INCLUDE_DIR Tesseract_INCLUDE_DIR-NOTFOUND
Tesseract_LIBRARY Tesseract_LIBRARY-NOTFOUND
VTK_DIR VTK_DIR-NOTFOUND
WEBP_INCLUDE_DIR WEBP_INCLUDE_DIR-NOTFOUND
WITH_1394 ON
WITH_ADE ON
WITH_ARAVIS OFF
WITH_CAROTENE ON
WITH_CLP OFF
WITH_CUBLAS ON
WITH_CUDA ON
WITH_CUDNN ON
WITH_CUFFT ON
WITH_EIGEN ON
WITH_FFMPEG ON
WITH_FREETYPE OFF
WITH_GDAL OFF
WITH_GDCM OFF
WITH_GPHOTO2 OFF
WITH_GSTREAMER ON
WITH_GTK ON
WITH_GTK_2_X OFF
WITH_HALIDE OFF
WITH_HPX OFF
WITH_IMGCODEC_HDR ON
WITH_IMGCODEC_PFM ON
WITH_IMGCODEC_PXM ON
WITH_IMGCODEC_SUNRASTER ON
WITH_INF_ENGINE OFF
WITH_ITT ON
WITH_JASPER ON
WITH_JPEG ON
WITH_LAPACK ON
WITH_LIBREALSENSE OFF
WITH_MATLAB OFF
WITH_MFX OFF
WITH_NGRAPH OFF
WITH_NVCUVID ON
WITH_OPENCL ON
WITH_OPENCLAMDBLAS ON
WITH_OPENCLAMDFFT ON
WITH_OPENCL_SVM OFF
WITH_OPENEXR ON
WITH_OPENGL ON
WITH_OPENJPEG ON
WITH_OPENMP OFF
WITH_OPENNI OFF
WITH_OPENNI2 OFF
WITH_OPENVX OFF
WITH_PLAIDML OFF
WITH_PNG ON
WITH_PROTOBUF ON
WITH_PTHREADS_PF ON
WITH_PVAPI OFF
WITH_QT ON
WITH_QUIRC ON
WITH_TBB ON
WITH_TENGINE OFF
WITH_TESSERACT ON
WITH_TIFF ON
WITH_V4L ON
WITH_VA OFF
WITH_VA_INTEL OFF
WITH_VTK ON
WITH_VULKAN OFF
WITH_WEBP ON
WITH_XIMEA OFF
WITH_XINE OFF
opencv_dnn_PERF_CAFFE OFF
opencv_dnn_PERF_CLCAFFE OFF
We can see that CUDA is enable imo but also that NVCUVID is even if I thought it was not until now
END EDIT
At last I will try the ccmake function when the current build is over and edit or post the result.
Once again thank you all for your support !!

Answer 1

It took me more than two weeks / dozens of hours to finally make it work (my config is similar). Here's what I did (I hope I remembered everything):
my system:
Ubuntu 18.04 on i7-4790 + GTX1050Ti (driver ver. 460.39) + CUDA 10.2 + OpenCV 4.5.1 + ffmpeg
OpenCV and ffmpeg were build with CUDA support.
OpenCV build options:
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_C_COMPILER=/usr/bin/gcc-7 \
-D CMAKE_INSTALL_PREFIX=/usr/local \
-D INSTALL_PYTHON_EXAMPLES=ON \
-D INSTALL_C_EXAMPLES=ON \
-D WITH_TBB=ON \
-D WITH_CUDA=ON \
-D WITH_NVCUVID=ON \
-D WITH_NVCUVENC=OFF \
-D BUILD_opencv_cudacodec=ON \
-D WITH_CUDNN=OFF \
-D OPENCV_DNN_CUDA=OFF \
-D CUDA_ARCH_BIN=6.1 \
-D ENABLE_FAST_MATH=1 \
-D CUDA_FAST_MATH=1 \
-D WITH_CUBLAS=1 \
-D WITH_V4L=ON \
-D WITH_QT=ON \
-D WITH_OPENGL=ON \
-D WITH_GSTREAMER=ON \
-D OPENCV_GENERATE_PKGCONFIG=ON \
-D OPENCV_PC_FILE_NAME=opencv4.pc \
-D OPENCV_ENABLE_NONFREE=ON \
-D OPENCV_PYTHON3_INSTALL_PATH=/usr/lib/python3.6/site-packages \
-D OPENCV_EXTRA_MODULES_PATH=/path/to/opencv_contrib-4.5.1/modules \
-D PYTHON_EXECUTABLE="/usr/bin/python2" \
-D PYTHON_DEFAULT_EXECUTABLE="/usr/bin/python3" \
-D PYTHON3_EXECUTABLE="/usr/bin/python3" \
-D BUILD_EXAMPLES=ON ..
ffmpeg - I used one of many widely available tutorials on building ffmepg with CUDA support, my build looks like this:
ffmpeg version N-101174-g14dc28e969 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
configuration: --prefix=/home/lg/ffmpeg_build2 --pkg-config-flags=--static --extra-cflags=-I/home/lg/ffmpeg_build2/include --extra-ldflags=-L/home/lg/ffmpeg_build2/lib --extra-libs='-lpthread -lm' --bindir=/home/lg/bin2 --enable-cuda --enable-cuvid --enable-libnpp --extra-cflags=-I/usr/local/cuda/include/ --extra-ldflags=-L/usr/local/cuda/lib64/ --enable-gpl --enable-opencl --enable-opengl --enable-libass --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libfdk-aac --enable-libvpx --enable-libx264 --enable-libx265 --enable-nvenc --enable-vaapi --enable-vdpau --enable-nonfree --cpu=native --extra-cflags='-march=native'
Although compiling OpenCV 4.5.1 was successfull, the c++ samples using simple cv::cudacodec::createVideoReader() didn't work, the error was
The function/feature is not implemented) The called functionality is disabled for current build or platform in function 'throw_no_cuda'
I downloaded NVIDIA's Video_Codec_SDK_10.0.26 and copied nvcuvid.h, cuviddec.h and nvEncodeAPI.h from /Interface to CUDA's include dir (in my case /usr/local/cuda-10.2/targets/x86_64-linux/include) and to /usr/inlcude. It was probably not necessary to put all these files to both locations.
recompile OpenCV again. It was crucial to set these two options:
-D WITH_NVCUVID=ON \
-D BUILD_opencv_cudacodec=ON \
Without them the OpenCV didn't have NVCUVID module installed.
Compiling failed with error, it complained about cudaVideoCodec_AV1 is not declared or something similar, in file opencv_contrib-4.5.1/modules/cudacodec/src/video_decoder.cpp, line 81.
Since I didn't plan to use AV1, I simply removed this line. After this the compilation was finally successful.
Time to check the CUDA VideoReader sample - decoding H264 worked! But HEVC didn't - the error was unknown FourCC code in opencv_contrib-4.5.1/modules/cudacodec/src/ffmpeg_video_source.cpp (my video has 'hev1' FourCC).
So I added the missing definitions:
case CV_FOURCC_MACRO('H', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', 'c'): return HEVC;
changed to:
case CV_FOURCC_MACRO('H', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', '2', '6', '5'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', '1'): // fallthru
case CV_FOURCC_MACRO('h', 'v', 'c', '1'): // fallthru
case CV_FOURCC_MACRO('h', 'e', 'v', 'c'): return HEVC;
Then recompile OpenCV for the last time and finally everything works.

Answer 2

(This answer is only speculative; and I'll (possibly) edit it if you post information about your CMake build log.)
OpenCV is telling you that it has no_cuda, i.e. CUDA functionality is disabled for current build or platform
That means one of two things:
Despite your "best intentions" setting a bunch of CMake flags, your OpenCV was built without CUDA support. This is quite possible, since sometimes -D values are ignored in favor of what's detected, or cannot apply without certain additional settings etc. You should try using ccmake in your build directory and see what comes up.
The build is CUDA-enabled, but OpenCV code was unable to find a CUDA driver, or the CUDA runtime library, or a usable responsive GPU etc. I'm not an OpenCV expert, but assuming it offers some logging facilities, I'd check that out. #user2986898 adds that you can get the build information at run-time using the cv::getBuildInformation() function.
It might also be useful to build the tests or examples for OpenCV and check whether those work.