@factdew make sure that you have all drivers updated. It is possible that some update on your OS caused this. You did not say what OS you are using but check [https://support.lenovo.com/us/en/downloads/ds545260-integrated-camera-driver-for-windows-10-version-1709-or-later-thinkpad|on here]
Of course, there is always the possibility that your camera actually has failed or disconnected. Use the [document|39685] to work on your computer. Page 100 addresses the camera.