How do you take video and paste it on video?

[yuvlevental]

http://youtube.com/watch?v=OZS61SrD3Ws

I won't mind if you need mac os x/xp

[Fbot1]

either use something like this: https://addons.mozilla.org/en-US/firefox/addon/3006 or go into tools > page info > media.

[yuvlevental]

erm... i meant something among the lines of taking king leonidas's head and pasting it on a person moving whilst keeping the mouth moving

[Fbot1]

Cinelerra might.