Are you using After Effects or Vegas Pro? If you're using Vegas, you should probably post in a Vegas forum. If you're using After Effects, the Rotobrush tool is what you want. The process of cutting something out of video is called Rotoscoping.
- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.