Hi, I'm Robinson, and I’m happy to help you today.
I know how frustrating this may be for you but I'll do my very best to help you.
Here is some troubleshooting that you can try and should fix the problem.
Check if doesn't have any corrupt files on the windows.
1-Right-Click on Start then click on Windows Powershell (admin)
2- Type these commands.
sfc /scannow (and press Enter)
Dism /Online /Cleanup-Image /ScanHealth (and press Enter)
Dism /Online /Cleanup-Image /CheckHealth (and press Enter)
3- The DISM tool will report whether the image is healthy, repairable, or non-repairable. If the image is repairable, you can use the /RestoreHealth (Dism /Online /Cleanup-Image /RestoreHealth) argument to repair the image.
Check in the privacy settings if the apps have permission to access the camera.
1-Click on Start then click on Settings
2-Click on Privacy, then click on Camera
3-Check the permissions to access the camera
Another option that you can try is to re-enable the camera in the Lenovo Settings app.
1- Launch the Lenovo Settings app using the Start menu search bar. In case, you have not installed it already download it from Windows Store.
https://www.microsoft.com/en-us/store/p/lenovo-...
2- Here you need to click on the Camera icon available at the top right side of the window.
3- Scroll down to the Camera settings page until you find Privacy Mode. Here turn off the Turn Privacy Mode.
4-Reboot and try to access the camera again