You make your own & script it & show it in GUI or you might be able to buy something to help you but you’ll still need to code some stuff. Playmaker may help you if you prefer visual scripting.
Here are some tutorials that will send you on your way to knowing the answers to all your questions or at least give you the fundamental knowledge you need to know how to approach those problems:
http://unity3d.com/learn/tutorials/
Import the “standard assets” (can be found on the asset store) into your project. They contain some post processing effects that can be applied to the camera. “Effect” is a very general term. You should be more precise in your questions. I’m guessing you mean post-fx but you could as well have meant particle effects etc…
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