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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1Possible duplicate of Create invisibility cloak (alpha mask material) – Samoth Feb 12 '16 at 10:17
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related: http://blender.stackexchange.com/questions/1103/composite-a-3d-object-into-a-photograph – Feb 12 '16 at 15:29
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Neither of those will help. This needs to be done with rotoscoping, it would be too complex to do it in any other way. – TARDIS Maker Feb 12 '16 at 17:52
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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:

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

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.
GiantCowFilms
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2Just 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 '14 at 06:46
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1@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 -- – ruckus Feb 12 '16 at 17:50