https 가 아니면 다음과 같은 에러가 발생했음

[Deprecation] getUserMedia() no longer works on insecure origins. To use this feature, you should consider switching your application to a secure origin, such as HTTPS. See https://goo.gl/rStTGz for more details.

NotSupportedError

pc.getSenders();
pc.getSenders().forEach(sender => {console.log(sender)});
pc.getSenders().forEach(sender => {console.log(sender.track)});
pc.getSenders().forEach(sender => {console.log(sender.track.kind)}); // video, audio
pc.getSenders().forEach(sender => {console.log(sender.track.enabled)}); // true
pc.getSenders().forEach(sender => {console.log(sender.track.muted)}); // false

https://developers.google.com/web/tools/chrome-devtools/remote-debugging/ 크롬 console.log를 데스탑에서 확인하기