2D Pixel game: Tilt shift tutorial or advices needed

Do anyone know a tutorial or something how I can set up a tilt shift effect to my 2D game? I want do something similar as in the Links Awakening Remake to get more depth. I found this, but a tutorial or how to would be helpful:

https://docs.unity3d.com/550/Documentation/Manual/script-TiltShiftHdr.html