(THE MASK CHALLENGE)How do I mask a moving image?

I see this a lot in OLD NAVY commercials or any TV commercial.
CHALLENGE 1.)for example, say I import a mpeg of a man walking, how do I cut only him out and place him in front of another background?
CHALLENGE 2.)I am only able to cut a still image(jpeg) of a man and put him in another background, but there are still some white spots that I haven't been to cut out between his arms. Is there a lasso magnet tool that can help me cut him out more detailed or more precisely? Thanks for all there help if anyone knows this.

Just what specialcase said roto, or keying - or a combination of both. In the case of the Grass spot above, it wasn't shot for keying - the whole idea of placing the grass people over a close up of the grass was an after-the-fact idea on my part. It probably took me a couple of days straight (spread over a week or so - it is tedious) to roto the shots in that spot.
In this PSA, my son was shot against greenscreen and I keyed him over the background that was shot later. It was a bit problematic because it was shot very quickly in 15 minutes at the tail end of a regular commercial shoot, but it holds up pretty well.
I just completed a couple of commercials for Coffee-mate that involved a combination of difference matte, luma/chroma keying and straight paint roto, but I can't show you those yet as they have not aired. They're pretty seamless. I did all that work in Shake.
I'm sorry to say that I don't know of any sites that offer flat out instructions on how to do this stuff, I think it's largely a learn as you go kinda thing. At least for me it has been. There are some good books for learning the software, but how to apply that knowledge is a matter of experience.
Good luck, post your work for us to see...
Patrick

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IF so how please? See Pic.
I want Mask 2 the circle to follow mask 1 the "open path" from one end to the other over time. Without Manually KFraming each position. I'd rather do like 'text on a path' except using a mask shape instead of text. Animating via First or last Margin. Is that possible?
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Dave your instructions or work around are not clear to me.
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(THE MASK CHALLENGE)How do I mask a moving image?

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