I had searched a lot of DEMO and examples about getUserMedia , but most are just camera capturing, not microphone.
So I downloaded some examples and tried on my own comp
It is currently not available in Google Chrome. See Issue 112367.
You can see in the demo, it will always throw an error saying
GET blob:http%3A//whatever.it.is/b0058260-9579-419b-b409-18024ef7c6da 404 (Not Found)
And also you can't listen to the microphone either in
{ video: true, audio: true }