Safari
Please follow the instructions at:
https://support.apple.com/guide/safari/websites-ibrwe2159f50/15.1/mac/12.0
Google Chrome
Please follow the instructions at:
https://support.google.com/chrome/answer/2693767
Microsoft Edge
Please follow the instructions at:
(Scroll to: How to allow a website to use your camera or microphone while browsing in Microsoft Edge)