For more detail this asset from the Unity Asset Store: Click Here
This is a paid asset, but now you can download True Parallax for FREE, Please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
True Parallax v1.0.5
Parallax is a difference in the apparent position of an object viewed along different lines of sight.
Features:
– Supports gyroscope and accelerometer to obtain device orientation;
– Adds the parallax effect to any object or group of objects in scene;
– Easy integration with popular GUI assets like NGUI;
– Comes with demo scene.
Supported platforms – iOS, Android and Windows Phone.
Watch True Parallax in work demo: http://youtu.be/RkdJjp4xki0