How to make floating camera in 2d platformer on unity3d?

Question

Unity

How to make everything look like it's under water during the game?
To make it look like the main character is drunk?

Answer 1

Are you talking about a picture / render? distortion and color change? then read about Post-processing and ImageEffect and how to do them in Unity (whatever version you have 5.6 or something older). even in the standard assets there is a set of example effects.
https://docs.unity3d.com/Manual/PostProcessingOver...
https://docs.unity3d.com/550/Documentation/Manual/...
or are you talking about shaking the camera? then the script or animation is looped on the camera object.