a stupid question I know, but i am an amateur. And Im not sure if this is the right place to post but couldn't find anywhere to post.

http://youtube.com/watch?v=XHnzjV8SaEY

lol if you watch this music video, you'll see in the background, it plays clips from the movie dr.dolittle...I know for a fact that the footage was added in afterwards and I was wondering what software of program do i need to be able to do the same thing?? I have adobe premiere elements 4.

If anyone can give me any help, I would really, really appreciate it.

Thank you heaps in advance.
Sofiya.