Apple Photobooth similar Keying technique

[mvitsor]

Apple Photobooth recognizes a still background and then replaces it with another background. It works like a Chroma Key, except for the fact that you don't need a green screen. The big problem is that I don't have a Mac and even if I had one, I wouldn't be able to export it to a movie and edit the background manually.
So, can I use a similar technique to key a video? The camera doesn't move and I have an image of the background besides of the recording itself. What can I do?

[david walsh]

In Premiere there is an effect called "Difference Matte", this does what you want. But it's never just a clean and simple removal of the background and is normally used in conjunction with other compositing techniques such as limiting the amount of masking.

David.