Cmake build problem with opencv (error LNK2019) in vscode - c++

Question

So I've been trying to get started on opencv c++. I followed a tutorial on how to set it up, link here. I wrote a simple opencv script for an image display. I built the project after that and I got this error:
[build] main.cpp.obj : error LNK2019: unresolved external symbol "public: __cdecl cv::Mat::Mat(void)" (??0Mat#cv##QEAA#XZ) referenced in function main
[build] main.cpp.obj : error LNK2019: unresolved external symbol "public: __cdecl cv::Mat::~Mat(void)" (??1Mat#cv##QEAA#XZ) referenced in function main
[build] main.cpp.obj : error LNK2019: unresolved external symbol "public: class cv::Mat & __cdecl cv::Mat::operator=(class cv::Mat &&)" (??4Mat#cv##QEAAAEAV01#$$QEAV01##Z) referenced in function main
[build] mingw32-make[2]: *** [CMakeFiles\opencv.dir\build.make:152: opencv.exe] Error -1
[build] mingw32-make[1]: *** [CMakeFiles\Makefile2:838: CMakeFiles/opencv.dir/all] Error 2
[build] mingw32-make: *** [Makefile:120: all] Error 2
[build] main.cpp.obj : error LNK2019: unresolved external symbol "class cv::Mat __cdecl cv::imread(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (?imread#cv##YA?AVMat#1#AEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##H#Z) referenced in function main
[build] main.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::namedWindow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,int)" (?namedWindow#cv##YAXAEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##H#Z) referenced in function main
[build] main.cpp.obj : error LNK2019: unresolved external symbol "int __cdecl cv::waitKey(int)" (?waitKey#cv##YAHH#Z) referenced in function main
[build] main.cpp.obj : error LNK2019: unresolved external symbol "void __cdecl cv::imshow(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class cv::debug_build_guard::_InputArray const &)" (?imshow#cv##YAXAEBV?$basic_string#DU?$char_traits#D#std##V?$allocator#D#2##std##AEBV_InputArray#debug_build_guard#1##Z) referenced in function main
[build] opencv.exe : fatal error LNK1120: 7 unresolved externals
I did some research but most of the answers were for Visual Studio users and I'm using vscode, not that. Here's how my CMakeLists.txt look like:
cmake_minimum_required(VERSION 3.0.0)
project(opencv VERSION 0.1.0)
include(CTest)
enable_testing()
find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
add_executable(opencv main.cpp)
target_link_libraries( opencv ${OpenCV_LIBS} )
set(CPACK_PROJECT_NAME ${PROJECT_NAME})
set(CPACK_PROJECT_VERSION ${PROJECT_VERSION})
include(CPack)
How can I fix this error and what was the cause of it? By the way, I'm using VS Build tools 2019.
Edit:
So I tried changing my Cmake kit to my usual compiler, MingW64 and the code seems to be compiling fine. The error only really happens with the Visual Studio C++ compiler. Why does it only happen to the VS compiler though?