getUserMediaConstraints.js

/* request access to just the user's camera */
{ video: true }

/* request access to the user's microphone and camera, with a preferred resolution of 1280X720 */
{
  audio: true,
  video: { width: 1280, height: 720 }
}

/* request access to the user's microphone and camera, with a minimum resolution of 1280X720 */
{
  audio: true,
  video: {
    width: { min: 1280 },
    height: { min: 720 }
  }
}