how to display the view of camera in gazebo window (not in another window like the tutorial)

in this tutorial, http://gazebosim.org/tutorials?tut=wide_angle_camera&branch=wideanglecamera#Whattoknow? step 6: Press Ctrl+T to open list of topics, find corresponding element in ImageStamped section and start visualization. this step displays the view of the camera in another window. But I want to display the view in the front of camera model (it displays like-mosaic), and I saw somebody do this on youtube. Is anybody knows how to do this?