Animated Skybox?

Hello, anybody know how I can create such a Skybox that rotates in C#?

Example: 32. Unity3d Tutorial - Saving Character Data 6/6 - YouTube

Sadly he didnt showed how he did it.

When he pressed the create “Create” in the video and took control of the camera, the skybox stopped “moving”.
I don’t think he is using a animated skybox in this video. He’s probably just slowly rotating the camera.

Check out this question: How do I make a moving skybox? - Questions & Answers - Unity Discussions .
It’s got some pretty useful information and links that might help you.