Samsung have a couple of suggestions on how to resolve this issue on their website.
1. Reset the Camera app
2. Force restart your device
3. Reboot the phone in Safe Mode
4. Perform a Factory Reset
5. Request a Service
[link|https://www.samsung.com/ph/support/mobile-devices/how-to-fix-camera-failed-error-on-samsung-galaxy-phone/#:~:text=Go%20to%20Settings.,prompts%20to%20complete%20the%20reset.|https://www.samsung.com/ph/support/mobile-devices/how-to-fix-camera-failed-error-on-samsung-galaxy-phone/#:~:text=Go%20to%20Settings.,prompts%20to%20complete%20the%20reset.]