Chorma key question

[falcont2t]

well guys i have been doing some stuff with the chorma key thing, and i was wondering if theres a way to do good chroma work with moving takes, because as you see i added the motion after rendering the shots.
any help? here you have 2 takes:
[media]http://www.youtube.com/watch?v=0TMEPOAX3oI[/media]
[media]http://www.youtube.com/watch?v=5xF6RVgyMrQ[/media]

[blackXmesa66]

chroma key.

I did some work with it.. you've pretty much got it down... just get better ideas goin with the videos

Here are some of the random ass tests I did with chroma and motion tracking

[video=youtube;SYRXB4v972Y]http://www.youtube.com/watch?v=SYRXB4v972Y[/video]
[video=youtube;IcKZnE8V0Ds]http://www.youtube.com/watch?v=IcKZnE8V0Ds[/video]
[video=youtube;B6BE4EkJ6EM]http://www.youtube.com/watch?v=B6BE4EkJ6EM[/video]
[video=youtube;uQJmMZ7WqWc]http://www.youtube.com/watch?v=uQJmMZ7WqWc[/video]