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Re:A real world guide to WebRTC by tracker1 on Monday July 17, 2017 @03:03PM (#14791390)
Not sure about in the phone, but in the desktop versions, you can click the (i)/Secure icon to the left of the website to review/change your permissions for the site.

For mobile, it looks like you can hit the vertical menu button in the top right, then the (i) icon, then Site Settings...

Re:A real world guide to WebRTC by notnarb on Monday July 17, 2017 @05:10PM (#14792290)
The example site provided ( https://greggman.github.io/doodles/html5-webcam-iframe.html ) serves an iframe from a different domain so the site settings on the visible page do not affect the actual camera permissions:

Site settings: http://imgur.com/a/JIDeD (note: camera is set to 'block', but there is still the red dot in tab indicating camera access)

Camera usage: http://imgur.com/a/3HXHo (note: different domain listed)