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For this to work you would need to be able to read from the onboard/usb camera using VideoCapture with FFmpeg. That is the following would need to work on your system
VideoCapture cap(0, CAP_FFMPEG);
on my laptop this fails with the inbuilt web cam.
The reason this needs to work is that cv::cudacodec uses FFmpeg to read video streams which don't come from files.
Out of interest what codec is the video encoded with?