How to get a transcript of an audio or video call within a js web app? I.e. how to route a MediaStream to a speech-to-text API

I want to make a web-app which does video calls with live transcription -- using some 3rd party speech-to-text service (e.g. Google or Amazon). So the peer-to-peer MediaStream would be played to the users, and also sent to the API for transcription.

I am currently using https://peerjs.com/ to create the peer-to-peer call.

Is this feasible? Are there any code examples or libraries I could use?

Thank you, Daniel

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