docs: public void zoomIn(GVRScene... gvrScenes) {
          for (GVRScene gvrScene : gvrScenes) {
              try {
                  GVRPerspectiveCamera leftCameraMainScene = ((GVRPerspectiveCamera) gvrScene.getMainCameraRig().getLeftCamera());
                  GVRPerspectiveCamera rightCameraMainScene = ((GVRPerspectiveCamera) gvrScene.getMainCameraRig().getRightCamera());
                  if (leftCameraMainScene.getFovY() > MAX_ZOOM) {
                      leftCameraMainScene.setFovY(leftCameraMainScene.getFovY() - ZOOM_FACTOR);
                      rightCameraMainScene.setFovY(rightCameraMainScene.getFovY() - ZOOM_FACTOR);
                  }
              } catch (ClassCastException e){
                  throw new UnsupportedOperationException("Operation unsupported for this camera " +
                          "type");
              }
  
          }
      }