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Basically I do not get why people use other libraries to import video's in openCV. If you follow the tutorials correct and the data type of your video is supported, than the following classes are all you need for processing video data.

I succeed in processing up to 40 frames per sec on my webcam, and up to 25 frames per sec on a video, by just using the standard C++ implementation

Another positive thing about it is that people do not need to handle decoding frames themselve if they use the standard read functionality. Max speed all depends on window size and hardware performance.