I'm looking to hide the webgazer video feed using Javascript. The following code displays video feed and how to hide the video feed as my task is to give more space for displaying diagrams and text.

window.onload = function() {
  webgazer.setRegression('ridge') /* currently must set regression and tracker */
    .setTracker('clmtrackr')
    .setGazeListener(gaze)
    .begin()
    .showPredictionPoints(true);

  var width = 320;
  var height = 240;
  var topDist = '100px';
  var leftDist = '400px';

  var setup = function() {
    var video = document.getElementById('webgazerVideoFeed');
    video.style.display = 'block';
    video.style.position = 'absolute';
    video.style.top = topDist;
    video.style.left = leftDist;
    video.width = width;
    video.height = height;
    video.style.margin = '0px';
    webgazer.params.imgWidth = width;
    webgazer.params.imgHeight = height;
    var overlay = document.createElement('canvas');
    overlay.id = 'overlay';
    overlay.style.position = 'absolute';
    overlay.width = width;
    overlay.height = height;
    overlay.style.top = topDist;
    overlay.style.left = leftDist;
    overlay.style.margin = '0px';
    document.body.appendChild(overlay);
    var cl = webgazer.getTracker().clm;

    function drawLoop() {
      requestAnimFrame(drawLoop);
      overlay.getContext('2d').clearRect(0, 0, width, height);
      if (cl.getCurrentPosition()) {
        cl.draw(overlay);
      }
    }
    drawLoop();
  };