Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Parallax Scrolling VZ Free.
Parallax Scrolling VZ v1.2.0
Parallax Scrolling VZ provides an easy-to-use framework to create parallax scrolling backgrounds in Unity.
Try it Here
Demo Video
Tutorial – Texture Offset
Tutorial – Infinite Cam Follow
More Tutorials Here
Documentation
3 TYPES OF PARALLAX:
Infinite Texture Offset
– Constantly wraps the background textures
Non-Infinite Camera Follow
– Parallax based on character movement – textures do not repeat. Great option for long levels with different textures
Infinite Camera Follow
– Parallax based on character movement – textures repeat themselves.
FEATURES:
– Easy-to-setup Horizontal & Vertical Parallax scrolling for 2D Games
– Uses orthographic cameras
– 3 Types of Parallax included
– Uses texture quads
– Infinitely wrap textures along both X and Y axis
– Parallax scrolling based on the camera following the character’s movement
– Custom inspector for texture offset scrolling
– Ability to find pixel-perfect X & Y scale for your textures
– Prefabs with camera & layers attached for easy change out
– Ability to change scrolling speed & Z-depth for each background layer
– C# scripts
– Demo scenes