webrtc_a.js

async function start() {
  console.log('Requesting local stream');
  startButton.disabled = true;
  try {
    const stream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});
    console.log('Received local stream');
    localVideo.srcObject = stream;
    localStream = stream;
    local_Video.srcObject = stream;
    callButton.disabled = false;
  } catch (e) {
    alert(`getUserMedia() error: ${e.name}`);
  }
}