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I have a video and a person walks in front of where I want to put the tracked model and I didn't know if you could cut him out so the model will go behind him like in AE or if that wasn't possible in blender.

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It is possible, since blender has fully featured masking capabilities. Here is a simple setup to show you how it works:

enter image description here

If you were able to shoot against a green screen, use this setup instead:

enter image description here

Note: If you need to feather a certain point on you mask, you can hit Alt-S. If you need to feather the whole mask, add a color ramp node after the mask node, you can then tweak the feathering.

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Just one comment. The way those things are done is using chroma keying in your video, otherwise masking has to be done manually and frame by frame. –  YoMismo Jul 18 at 6:46
    
@YoMismo, good point I'll add that! –  GiantCowFilms Jul 18 at 15:24
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