Layering video

In videos on youtube, there is a pretty common effect used where you record yourself talking twice, then layer the clips over each other so it appears that there are two people in one shot, even though it's the same person. Is there any way to do this through imovie? Is a green screen needed? Help!

ClairHL wrote:
.. that created one type of lighting, and then did a second shoot having it focus on the sky.. but changed the lighting for the field and made it look flat and without detail.
My question: is there a way of putting those two clips together somehow ...
you're asking for the latest and fanciest technology in photography: HDR
http://en.wikipedia.org/wiki/Highdynamic_rangeimaging
no, not avail in iMovie nor any edit-app to my knowledge. in professional movie-making, HDR-'film' is created using 50k$ tools as Shake etc. to compose such a (moving!) picture. maybe in iMovie vers23?
even in case you're recordings show a totally flat horizon, no tree, no landmarks (=what would make 'compositing' simple: masking upper half, lower half) - the two 'pannings' should be a 101% identically .. do you have a cyborg's arm?
the moment any camera-movement is involved, and you like to 'compose'/layer ... things get .. dirty complicated.
hint: don't hesitate to start your own threads.. your (interesting!) questions soon gets lost.
and, Welcome, ClairHL, to the  iMovie boards ..

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Thank you for your response.
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