video recorder using webrtc and javascript

<device type="media" onchange="update(this.data)"></device>
<video autoplay></video>
<script>
  function update(stream) {
    document.querySelector('video').src = stream.url;
  }
</script>function hasGetUserMedia() {
  return !!(navigator.mediaDevices &&
    navigator.mediaDevices.getUserMedia);
}

if (hasGetUserMedia()) {
  // Good to go!
} else {
  alert('getUserMedia() is not supported by your browser');
}<input type="file" accept="video/*;capture=camcorder">
<input type="file" accept="audio/*;capture=microphone"><video autoplay></video>

<script>
const constraints = {
  video: true
};

const video = document.querySelector('video');

navigator.mediaDevices.getUserMedia(constraints).
  then((stream) => {video.srcObject = stream});
</script><input type="file" accept="image/*;capture=camera">