Help me with some effects of FPS?

Hello everyone, could you help me?

I watched a video on youtube of a match made in Unity3D
Link:

It has two super video effects that I really wanted to know could help me?
The first is when you shoot a portion of the target and it falls apart, as does that?
The second is to look at the sight, I tried to reproduce this effect, put a second camera already in place and while you press the right mouse button changed to this camera but it was unrealistic and could use script errors as a targeting system using Raycaster …

Could you help me please? I researched on google and find nothing … I am appealing to you who know more … Please …

http://www.unifycommunity.com/wiki/index.php?title=AimDownSights
http://forum.unity3d.com/threads/91183-Released-Mesh-Destruction-quot-Piecemaker-quot?highlight=split
http://forum.unity3d.com/threads/57994-Simple-Fracture-Script-v-1.01?highlight=split

Thanks TvM79

Thanks!