How to create a Qt ROS GUI and integrate Turtlebot Video ?

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Firstly I am on ros Hydro because I try to make an application between my workstation and a turtlebot.

I have read this : http://wiki.ros.org/rqt But I don't find where create a Qt GUI is explained simply. I understood we have to create through catkin_ws a rqt package that we can modify directly with Qt when we open the CmakeList.txt . Then we can create with Qt Creator the interface and the .ui

until here am I right ?

But then how can we get the video (or the pictures) from the kinect of the turtlebot in our GUI ?