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How frustrating! I just started getting this on my S7. I can't believe Samsung has had this problem for so many years now on all their phones and not fixed it. This is a huge flaw and knowing it I won't be spending hard earned money on another Samsumg phone. What a racket! Get it together Samsung!
this is what worked for me, plug your phone to a computer, start dex on pc and go to apps, browse for camera app and open, if camera working correctly on pc display, go to your phone and try to start camera app, it should tell yo to reset the app, press ok, if working fine disconect cable and you are done.