Hey, I totally forget to pack a file in it (ups). But if you have interest in the code i just send you the sources where i borrowed it from.
If you want to watch my post mortem: https://www.youtube.com/watch?v=9jgJyc481rQ
This website helps you with the basics http://docs.unity3d.com/410/Documentation/Manual/H...
Here is the Zoom function http://answers.unity3d.com/questions/20228/mouse-w...
The shader that i used http://answers.unity3d.com/questions/47385/looking...
That should be everything i used i hope it helps you in some way