The WebVIewer that is part of the Android system files App Inventor 2 uses is not a full featured browser. That is part of your issue.
You might have better success accessing your Web page using the ActivityStarter, that makes use of your Android's default browser.
If you want to work with "How do I get permission from the camera on this site or in others that need other functions such as microphone, location?", you probably cannot using App Inventor.
Regards,
Steve