How do I switch camera when I click on a button

SDK
1

I want to switch the camera with a button click. I know it can be done in the initialization. But say after I initialize with front camera, how do I change the feed to rear camera when a button is clicked. This is what I did, but it does not work

    deepAR.stopCamera();

    deepAR.startCamera({facingMode: "environment"});
2

Hi, here’s a code snippet for switching the camera on the Web SDK

 function startExternalVideo() {
        cleanupVideoObjects();
        // create video element
        var video = document.createElement('video');
        video.muted = true;
        video.loop = true;
        video.controls = true;
        video.setAttribute('playsinline', 'playsinline');
        video.style.width = '100%';
        video.style.height = '100%';

        // put it somewhere in the DOM
        var videoContainer = document.createElement('div');
        videoContainer.appendChild(video);
        videoContainer.style.width = '1px';
        videoContainer.style.height = '1px';
        videoContainer.style.position = 'absolute';
        videoContainer.style.top = '0px';
        videoContainer.style.left = '0px';
        videoContainer.style['z-index'] = '-1';
        document.body.appendChild(videoContainer);
  
        videoObjects.videoContainer = videoContainer;
        videoObjects.video = video;
          
        navigator.mediaDevices.getUserMedia({video: true}).then(function(stream) {
          try {
            video.srcObject = stream;
          } catch (error) {
            video.src = URL.createObjectURL(stream);
          }
          setTimeout(function() {
            video.play();
          }, 50);
        }).catch(function(error) {
            console.log('error in video play:', error);
        });

        // tell the DeepAR SDK about our new video element
        deepAR.setVideoElement(video, true);
          
        var loaderWrapper = document.getElementById('loader-wrapper');
        loaderWrapper.style.display = 'none';
      }

      function cleanupVideoObjects() {
        if (videoObjects.length > 0){  
            videoObjects.videoContainer.parentNode.removeChild(videoObjects.videoContainer);
            videoObjects.videoContainer = null;
            if (videoObjects.video.srcObject) {
              //getUserMedia starts a stream, all tracks on all streams need to be stoppedbefore calling getUserMedia again
              videoObjects.video.srcObject.getTracks().forEach(track => track.stop())
            }
            videoObjects.video.pause();
            videoObjects = {};
        }
      }