Not able to read Video from Capture Card with GPU (Unsupported Format) while Reading with CPU works fine

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Thank you for your answer.
I did a comparison within the Code that actually is functioning. Opening the camera like this works:

cv::VideoCapture camL(0, cv::CAP_V4L2), camR(1, cv::CAP_V4L2);

While opening the camera like this failed (camL.isOpen() and camR.isOpen() return false):

cv::VideoCapture camL(0, cv::CAP_FFMPEG), camR(1, cv::CAP_FFMPEG);

So there is something not working with FFMPEG. I will definitely try your linked suggestion and report on my progress.