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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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    $\begingroup$ 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. $\endgroup$ – YoMismo Jul 18 '14 at 6:46
  • $\begingroup$ @YoMismo, good point I'll add that! $\endgroup$ – GiantCowFilms Jul 18 '14 at 15:24
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    $\begingroup$ This answer is good for proffesionals but a bigginer this hint is very short. $\endgroup$ – user21753 Feb 12 '16 at 6:58
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    $\begingroup$ @Krishan I'm sorry but our site format does not support full tutorials. If you need more in depth instruction or step by step guidance, go to youtube to learn a little more about video masking in blender. Some search words i'd recommend are "Video Masking", "Blender Green-screen" Or "Video tracking in blender". thanks -- $\endgroup$ – Scalia Feb 12 '16 at 17:50

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