Processing video streaming

Yes, for processing large amounts of data, it is useful to use the GPU. Specifically — have had a positive experience with NVidia CUDA: ru.wikipedia.org/wiki/CUDA
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In this case, the easiest way not to invent bicycles, and to work with video as with video, writing a custom filter for video library ffmpeg, for example.
\rwww.ffmpeg.org/libavfilter.html here is documentation on how to do it.