which ios version solved ur cam issue?
I had this problem twice with my 7 Plus on 10.0.x and 10.1.x. It has not happened in months and not at all on 10.2.x or 10.3 beta.
I was thinking perhaps it was heat-related. When it occurred, I had been out in the sun on a hot day, and it was not resolved with a soft or hard reset; but after I shut off the phone for about 30 minutes, the problem was gone.
Maybe it has been resolved through software, or maybe it will reoccur on a hot day.