To make a tv that you can move:
Make a prop_physics and name it
set the model as the tv with no screen(Glass)
Make a brush that covers the tv screen, then make it func_brush, name it, set parent to the name of the prop_physics, and give the front face the tvmonitor texture as described in the tutorial.
then make a info_camera_link set its destination brush to the name of the func_brush, of course you have to make a camera like in the tutorial.
Set the camera_link to the camera, i cant check if that works now cus its late and im tired but i hope it will give you the idea
A example map
http://www.snarkpit.com/editing.php?page
files&download=166