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Almost any video player is able to pause and resume playback.
The zoom feature is something I saw only with a few apps, like TouchPlayer and Act1 Video Player.
The default video camera application in all phones has these features - Pause while taking video & resume it again later and zoom while taking Video.
Most of the phones takes video in low resolution. So the digital zoom will not affect clarity.
And I haven't seen a camcorder that will pause the video. Every one I have seen stops and makes a new clip every time you hit the record button.