What are realistic processing times for object tracking

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Good day, I'm new to the word of image recognition and computer vision. Can someone perhaps give me an indication if it would be possible to speed up video processing for object tracking?

To be more clear - Can I fast forward the video to analyze the footage so that a 2 hour video is processed in 30 minutes? System specs: Windows OS with OpenCV making use of the CPU only (i7), 2 M pixel video footage of 2 hours. Would this even be possible when using Linux and GPU?

Thanks!