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In the DOMError error code list, the WebRTC working group would like to have added. Name: ConstraintNotSatisfiedError Description: One of the mandatory constraints on the operation could not be satisfied. No error code is needed. Specification link: http://dev.w3.org/2011/webrtc/editor/getusermedia.html#attributes-4
IDL needs to take care of the exception story for the web. Reassigning relevant bugs.
It seems this was resolved by defining a new exception class inline: https://w3c.github.io/mediacapture-main/getusermedia.html#overconstrainederror-object.