Oneplus 7pro camera stopped working

I would like to see if I can get some help. My oneplus 7 pro recently had the front facing camera stop showing an image. It would still pop up but with a black screen but showed the screen buttons. I tried to get it to work. Now as of today, I have nothing but black screen and no buttons to touch. The pop up camera still comes up and then after a little bit goes down. But total black screen. When in app like facebook and wanting to take a picture for a comment, nothing but black screen and then back to the post. Trying to take a picture by touching the camera button, nothing but black screen. Not even a way to change from back to front. Can anyone tell me what happened and how to hopefully fix this problem?