Video editing question (sort of PiP thing?)

This is kind of hard to explain, but here goes.

I'd like to know how it would be possible to take a video clip, any format really (avi, mpeg, whatever) and isolate a certain small area of it, and turn that area into a clip of its own.

Since i'm not sure if I am making that very clear, picture this, for an example's sake. Let's say there is a video clip of a man sitting at a desk, facing the camera, and he's talking. Let's presume the clip is at 640x480 resolution, or something. Now, if I wanted to make an avatar sized video clip (like 100x100 or something) of nothing but the guy's head as he talks, how would I do this? How can I isolate that specific area from the center of the clip and turn that area, with all the frames running but everything else excluded, into a separate clip?

I know this is doable, but I've never known how. I'd like to know. Please help me out.

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Hello, World!

What program are you using?
So you want to crop the video, right?

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yup, cropping is what comes to mind.
Most programs have a crop tool, check in the transform menus, It will help to know what program you are using as well?

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That's cool, I'll check that out.

I was always under the impression that cropping simply meant removing the very edges of a video, for the purpose of removing those uneven edges or other junk that you get there occasionally when recording from various subpar sources and stuff.

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Hello, World!

I can see that point, I did when I first started making videos. So would you like some more help, or has this helped enough?

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Actually, this led me in the right direction! And I succeeded in what I was trying to do, perfectly, and learned a lot in the process.

Thanks for all the help.

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Hello, World!

Glad to help, when I recieved the PM, I thought it was really gonna stump me

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