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pixel change detection

Hello,

Fair warning, total noob question. I'm curious to see if OpenCV is even the correct library for this use case.

The user would like to zoom into a section of the footage, an "area of interest" to quickly see all the "clips" of when any activity took place within said "area of interest".

On a primitive level, this is essentially pixel change in a localized area, so I'm not sure machine learning or CV is necessary - but I'm open to whatever the simplest solution is, especially if something out of the box already works.

But ideally, we'd like to train a model so it knows what is "normal" activity (i.e. mailman), and what isn't (i.e. vandal).

Any feedback on the simplest way to make this happen is greatly appreciated!

Thanks, Nick