Get permission only WEBRTC

usermediapermission.js

function getUserMediaPermission() {
  return new Promise((resolve,reject) => {
    navigator.mediaDevices.getUserMedia({ video: true, audio: true })
      .then(stream => { stream.getTracks().forEach(t => t.stop()); resolve(true) })
      .catch(() => { resolve(false) });
  });
}

// usage
getUserMediaPermission().then((granted) => { console.log(granted) });