http://answers.unity3d.com/questions/147988/how-to-pause-the-main-camera-.htmlhtml
I would simply pause the game with Time.timeScale = 0, and then do the following commands to Camera.main:this
Also, when you setup a script to do this, DO NOT use Update or LateUpdate to perform these tasks because they will not be called if the game is paused.spa
http://forum.unity3d.com/threads/47069-Stop-Camera-Rendering3d
Set the camera object inactive or disable the camera component.component
GameObject.Find only finds active objects.orm