A security camera is an NPC entity that automatically follows the player wherever he/she is in the room and are similar to the ones seen in the first Portal. Security cameras can be detached when a linked portal is placed behind it using triggers. The Portal 2 camera does not need a func_portal_detector.
2) Place the entity within the level by clicking anywhere in the 3D viewfinder.
2) Double-click on the entity to adjust its properties.
Value Skin 0: Clean Skin 1: Dirty