Hi,
In addition to what suggested by S.Sengupta, this issue is normally caused by drivers.
If Update camera driver didnt help, try reverting the camera drivers back to the officially supported manufacturers version see if it work. I suggest you download the version from manufacturer website for one more try. In the other hand, if you are using a driver from manufacturer, try uninstall this camera and install with Microsoft version.
Here is a similar case from Lenovo for your reference
Please note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
Regards,
D. Wu