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Comparison between a image capture and real-time video feed

Hi guys,

New to OpenCV here. I'm creating an object detection program and was wondering if it is possible to detect an object that enters in y real-time video feed.

I understand that I first have to initialize the camera with a capture to use it as my base comparison. After that I'm pretty stumped on how to use that initial capture to compare with the video feed.

Also would it be possible to draw a square around it and determine the coordinates of the newly detected object?

Thanks in advance, apologies if this question has been asked before or it seems rather simple.