var displaymediastreamconstraints = {
        video: true
    }
       navigator.mediaDevices.getDisplayMedia(displaymediastreamconstraints)
   .then(success).catch(error);

 ...
captureScreen(function(screen) {
video = document.getElementById('video-recorder')
video.srcObject = screen
recorder = new RecordRTC(screen, {
                type: 'video'
            })