function setwebcam(stream) {
  const video = document.getElementById("callermedia");
  video.srcObject = stream;
  video.muted = true;
  video.play();
 
  const servers = { iceServers: [{ urls: "stun:stun.l.google.com:19302" }] };
  user = new RTCPeerConnection(servers);
 
  stream.getTracks().forEach(function(track) {
    user.addTrack(track, stream);
  }); 
  user.addEventListener("track", setremotestream);
  user.addEventListener("icecandidate", setice);
}
function showerror(error) {
  console.log(error);
}