Computer Configuration > Administrative Templates > Google Chrome
Both
HKLM\Software\Policies\Google\Chrome
Setting the policy to Enabled or leaving it unset means that, with the exception of URLs set in the VideoCaptureAllowedUrls list, users get prompted for video capture access. Setting the policy to Disabled turns off prompts, and video capture is only available to URLs set in the VideoCaptureAllowedUrls list. Note: The policy affects all video input (not just the built-in camera).