simple-peer-video.js

var SimplePeer = require('simple-peer')

// get video/voice stream
navigator.getUserMedia({ video: true, audio: true }, gotMedia, function () {})

function gotMedia (stream) {
  var peer1 = new SimplePeer({ initiator: true })
  var peer2 = new SimplePeer({ stream: stream })

  peer1.on('signal', function (data) {
    peer2.signal(data)
  })

  peer2.on('signal', function (data) {
    peer1.signal(data)
  })

  peer1.on('stream', function (stream) {
    // got remote video stream, now let's show it in a video tag
    var video = document.querySelector('video')
    video.src = window.URL.createObjectURL(stream)
    video.play()
  })
}

Old code, it doesn't work now.
createObjectURL(stream) returns undefined
Sending signals in this way will break one of the pears, because they can send signals multiple times, but if you catch it more than ones, you get an exception.