"Photo Booth" Chroma key

anyone know of a plugin in FCP that will do a "chroma key" like the way photo booth does its' chroma key effect?
pretty much instead of keying out blue or green, photo booth asks you to step out of frame then saves the image, when you step back into frame it keys out the background the same way you could key out the color green.
I haven't seen it, but I'm wondering if there is a way to do this in FCP.

ok so most of my experience is w/ chroma key, so that is how I think of this. I understand that FCP takes the difference layer & thinks of it similar to a green screen. you adjust tolerance & threshold to fine tune the matte / key. I also know that there is a little bit of noise in the video (I'm shooting these tests on -6db gain to get the cleanest image) which will make the same pixel "NTSC" (never the same color frame to frame.
but this is the best I can get it w/ my tests
http://i30.tinypic.com/2dt3k3b.png
http://i31.tinypic.com/2hg6b2q.png
http://i28.tinypic.com/15eju4o.png
this is w/ the threshold at -90 & the tolerance at 0. is this filter really this poor, because I've hit the wall in the parameters and it feels like I should have more room to move around. is this the best FCP can do? if so is there a third party app that can actually do this better?
or are there any more tricks, like progessive vs interlace, DV vs HD, etc.
these are some of my first attempts that were creating more of a blended key.
http://i30.tinypic.com/k53fo2.png
http://i26.tinypic.com/9saplg.png
http://i31.tinypic.com/fvdxth.png

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