This question was previously considered & answered here on the Tor Project Forum, back in February:
Both Tails OS & Whonix are unable to run WebRTC for the same reason the Tor Browser is unable to run WebRTC, because it uses the UDP protocol which is currently not supported by Tor.
These links provide some additional information for Tails OS:
https://tails.boum.org/support/faq/index.en.html#voip
& Whonix (see the section entitled, “Software and Configuration”)
Whilst Tor doesn’t currently support UDP, nevertheless a proposal has been made to consider sending UDP traffic over Tor:
I hope this helps to answer your question.