Hello valery134 and welcome to Apple Support Communities.
I see you are having an issue with the camera in your MacBook Pro.
Start by setting up a test user account in order to isolate the issue to the system or the user data and ultimately resolve it.
How to test an issue in another user account on your Mac - Apple Support
While booted into the test user account, try a FaceTime call and see if you get the same result. If you get the same result while booted into the test user account, go to About This Mac under the Apple menu in the upper left of the screen and then click the button called System Report. Then, in the sidebar on the left, choose Camera.
If no camera is reported in that window, then this points to a hardware issue.
If the camera works in the test user account but not in the main user account, it may be an issue of a corruption in the user data. If that is the case, you'll want to reach out to Apple Support directly for additional options.
Contact Apple for support and service - Apple Support
Cheers.