This problem is caused by the camera backend reporting no zoom capabilities 
when the phone is switched to video recording mode.
This has been reported as bug #1517050

The UI is simply (and clumsily) reporting that it can't zoom.

The short term fix is probably to disable the zoom UI entirely when no
zoom capability is reported by the backend (possibly with some indicator
that zoom is unavailable, to prevent the user to think that pinch to
zoom is simply broken)

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https://bugs.launchpad.net/bugs/1388876

Title:
  Pinch to zoom not supported when taking video

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