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It sounds like you are in for some rotoscoping.
If you have a clean plate of the house and you shot with a completely stationary camera, then you may be able to use the Difference Matte effect to at least get you started. (This effect is almost never enough to get you a usable final result, but it can sometimes get you far enough that other techniques can get you the rest of the way.)
But I really think that you're going to end up rotoscoping. I recommend checking out the resources linked to from this page before you dive in.
Yes, it looks like the pen tool will be my friend for the next couple hours.... Thanks.
The tutorial that I like the best on Roto is from Scott Squires. He shows an amazing example. No matter what app you're using, the technique is the same.
Here's a link to Part 1
And a link to Part 2
You'll also want to watch the Invisible Pants articles. Find them Here and Here. While the tool he uses (commotion) is no longer available, the technique is exactly the same. Figure out the most effective way to draw your masks so the parts that move the most can be easily and quickly manipulated, fill in the parts that are missing by cloning or painting, and expect to spend a lot of time on the shots. There's also lots of other good stuff on Scot's Blog and his site. It's always good to take VFX lessons from a guy that started his career doing the cloud effects for Close Encounters of the Third Kind...