Is it possible to lock camera on unit with active portrait?

[gchibeni]

I want to make when a player clicks the middle mouse button it instantly locks the camera to the active unit. (Unit with active portrait. Like when you make your camera jump to this unit when you press Alt+C)

 

[Pyrogasm]

Middle mouse button can be detected as a mouse event. Use any camera lock system and apply it when such an event occurs.