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Re:Show HN: We made a web app so that our parents can keep r... by _benj on Sunday April 12, 2020 @07:11PM (#22851735)
I think that what camera is used doesn't depend on the app but on the browser. In mine (Firefox) it asks me if I want to give permission to the app to use the my camera AND it asks me which camera I want to give permission to. Chrome also has something like that (I think it's in the URL bar, an icon that looks like a video camera?)

Anyways, hope this helps!

Re:Show HN: We made a web app so that our parents can keep r... by benja123 on Monday April 13, 2020 @01:56PM (#22858167)
You are correct - that is one way, but with webrtc there is also a way to give users an option to pick which audio/video source