Live video capture while playing back another video track?

Is it possible to capture live video while another video track is being played back? I would like to do this for multitrack video recording of music: a) record a video track, then b) record a second video track while listening to/watching the first. Exactly like multitrack recording of audio as in Garage Band, but with video.
A similar question was asked here, but I want to avoid manual synchronization. http://discussions.apple.com/thread.jspa?messageID=11712024&#11712024
As an example, there are lots of multitrack videos on youtube, but you can often tell synchronization has been done manually as the audio and video are out of sync (even if only slightly):
http://www.youtube.com/watch?v=a2RA0vsZXf8&feature=related
Many thanks!

I'm not too familiar with video editing (yet), so please forgive me if I've misunderstood your suggestions. I think what I'm talking about would have to be done post (after shooting multiple video tracks?), and couldn't be done with video switching (live switching between multiple video feeds?). Here's a much better example of what I'm trying to do: http://www.youtube.com/watch?v=PGKErn2Zr88
What it boils down to in my mind is precise synchronization of a new capture with something pre-recorded (be it audio or video). If no software can do this (yet), perhaps there's a way to do it with additional hardware, for example playing video on a monitor while simultaneously recording with a camera, assuming the devices can be synchronized somehow?
Thanks!

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