Did you accidentally deny access for your camera and microphone on Google Chrome? You may have selected "Block" instead of "Allow". If so, you can still re-allow Chrome access to your camera and microphone.
If you did this on your android device, please see the help article: https://edthena.zendesk.com/hc/en-us/articles/360009796734-How-to-allow-camera-and-microphone-access-after-denying-on-Android
Here are instructions on how to proceed if "Block" is selected: