Camera is not workong

Camera on my One Plus is not working from today. When i open the app it either force closes or says cannot connect to camera. So, I restarted the mobile, no change. Reset, no change. Instead, camera app is now missing, but shows in apps inside setting. Tried different custom roms but camera app is missing. Installed different camera apps but non worked.

I havent dropped my mobile or done anything physical to mobile.

Please suggest me if any solutions... thanks