My name is***** am sorry to hear that you are having this issue.
I will be glad to assist you with this.
This could be a glitch in the software or settings and the iPhone needs to reboot, lets try and force a reboot > Hold the home button and the power button down for about 30 seconds or until the Apple logo appears on the screen, then release both buttons. Then check the camera for normal operation.
didn't work, but no time to deal with it now. I will wrap this up soon with you one way or another.
Okay, lets try a reset of the settings next. It will not erase any data or content.