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you need a 2nd camera..You probably have to do it in your web browser settings, since it's a browser-based website rather than an app.
My guess is if you go into the browser settings and look under permissions you might find camera and then you can choose which of the two cameras to use.
Or even in you computer control panel. Set the plug in device as the default...
I haven't got a second camera to test it though. So I don't know if either of those are a real solution