The same problem for me. Even if you give permission (you can do it on Firefox, Edge and Vivaldi have the option greyed out, not allowing you to change it) Odoo still asks for microphone/video access. Maybe it's due to a non-secure connection (through HTTP)?
Hello again, this is what I did but I can't change the status in the browser because the option remains greyed out with the message: "Blocked to protect your privacy".
This makes it impossible to modify.