¿How to make a difference keyer or matte using Motion?

Hi
Photo Booth can do it so I think Motion should do it. The problem it is that I don't find the right tool for this. I have got two street recorded shots. One just the street and the other one with one guy walking along the same street. I would like to remove te street of the guys'shot using this tool. ¿Can I do it using Motion?
Thank you

Probably a few ways to go about this. One would be to apply the Difference blend mode to the two clips in order to knock out the background, then use levels and/or threshold to try to create a white matte of the guy, and then use the whole group as an image mask applied to another copy of the video of him to mask him out.

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¿How to make a difference keyer or matte using Motion?

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