Example how to use combination of orthographics and perspective camera in 2D game to make good looking parallax effect.
Read full blog with explanation on Gamasutra: http://gamasutra.com/blogs/MichalBerlinger/20160323/268657/Combining_Perspective_and_Orthographic_Camera_for_Parallax_Effect_in_2D_Game.php
Thank Unity for providing free assets from platformer example!