well... it says in the sdk docs that you only need point_camera and info_camera_link to make said cameras work (cant see yourself apparently, no problems there)
the thing you need is a screen material
"An entity that can use point_cameras to render images for materials used by entities. To author the material, use the special identifier _rt_Camera for the $baseTexture (or whatever texture you want, like envmap, etc.) in the .vmt then connect the 'target' field to the entity which uses that material, and the 'PointCamera' field to the point_camera you want to have appear on that entity's material."
- info_camera_link