Hello.
Some laptop models have a camera on/off key, usually between F1 and F12 that must be pressed together with the FN key, or a protective cover on the camera. Check to see if your model has one of these.
Also click on start menu and type Device Manager
Expand Cameras > Right click on your camera > Uninstall.
Restart the device to reinstall the camera device and see if the issue persists.
If it persists, click on start menu and type msinfo32
Open System Information
Take a screenshot and post it here please.