Greetings!
This is Tin, may I know when did the issue start? Is there any changes made before you got this issue?
Please send the make and model of your device. (Please press Windows key + R and type msinfo32 and hit enter, look for system model)
Let's try to manually download and install the camera driver from Dell website. I'll give you the link.
Will wait for your response.
Thanks,
Tin