Can you zoom in a video?

Good question but I believe the answer is no. Sure wish I was wrong.

Sent from my Droid X using Tapatalk
 
With the default app? No. With some hacking, probably. In fact, even though it would be a 'digital zoom' (aka: crop), you'd probably be able to have the same effect as an actual zoom, because you're not using the cameras full resolution anyway. (I think the main reason why it can't take 8 megapixel film, besides the massive amount of storage, is because the phone can't encode that much data that fast).