Zooming while time lapsing

Short answer is that you don't.

Most time lapses that "Zoom" that I've seen were done with DSLRs at resolutions higher than video... i.e. 3000x2000 or higher. The images are then pan-'n'-scanned, or given the old Ken Burns treatment (i.e. zooming in post).

I hope that helps.
 
Depends on how long the shot needs to last... I would use an AC motor that drives a clock face, and somehow put a pully or some gears, foam wheel? to the zoom ring.

I once taped a still camera to the top of one of those on-off timers, it slowly rotated , turned lights on and off as needed, I got a most wicked 24hr time lapse of my front street.
 
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