A prebuilt version of OpenCV made for MinGW compiler (x64).
In the openCV site the prebuilt version for Windows is only made for Visual Studio compiler, so I needed to build the source myself with CMake to make it work for my case (MinGW x64).
I upload the files here in order to save me (and anyone with the same compiler) time in the future.
Tested versions: OpenCV 4.8.0 tested with g++ 8.1.0