Access Camera using OpenCV (Via GStreamer) - c++

Question

I'm trying to develop an application which should analyse a video stream from a MIPI camera(5MP). So I'm using gstreamer to get the video feed access it using OpenCV. I tried the following pipeline and it's working:
imxv4l2videosrc device="/dev/video0" ! autovideosink
But when I try to use it with OpenCV, it gives some errors.
VideoCapture cap("imxv4l2videosrc device=\"/dev/video0\" ! autovideosink");
OpenCV Error: Unspecified error (GStreamer: cannot find appsink in manual pipeline
) in cvCaptureFromCAM_GStreamer, file /root/OpenCV/opencv/modules/videoio/src/cap_gstreamer.cpp, line 759
VIDEOIO(cvCreateCapture_GStreamer (CV_CAP_GSTREAMER_FILE, filename)): raised OpenCV exception:
/root/OpenCV/opencv/modules/videoio/src/cap_gstreamer.cpp:759: error: (-2) GStreamer: cannot find appsink in manual pipeline
in function cvCaptureFromCAM_GStreamer
Then I tried to use the following pipeline, and it's not working as well:
VideoCapture cap("imxv4l2videosrc device=\"/dev/video0\" ! appsink");
ERROR: unrecognized std! 0 (PAL=ff, NTSC=b000
ERROR: v4l2 capture: unsupported ioctrl!
GStreamer Plugin: Embedded video playback halted; module imxv4l2videosrc0 reported: Internal data flow error.
ERROR: v4l2 capture: unsupported ioctrl!
OpenCV Error: Unspecified error (GStreamer: unable to start pipeline
) in cvCaptureFromCAM_GStreamer, file /root/OpenCV/opencv/modules/videoio/src/cap_gstreamer.cpp, line 832
VIDEOIO(cvCreateCapture_GStreamer (CV_CAP_GSTREAMER_FILE, filename)): raised OpenCV exception:
/root/OpenCV/opencv/modules/videoio/src/cap_gstreamer.cpp:832: error: (-2) GStreamer: unable to start pipeline
in function cvCaptureFromCAM_GStreamer
GStreamer version: 1.0
OpenCV version: 3.2
What is the piece i'm missing here?
Or is my approach is wrong?

Answer 1

Here is the answer to my question(with #Alper Kucukkomurler's help)
You can access the MIPI camera through OpenCV (with GStreamer) with
VideoCapture cap("imxv4l2videosrc device=\"/dev/video0\" ! videoconvert ! appsink");
Also If you want to change the resolution of the input, imx-capture-mode parameter can be used, which is of imxv4l2videosrc element.
For example,
imxv4l2videosrc imx-capture-mode=5 ! <other elements>