Where can I find video file of the menu background ?

[moadle]

Where can I find video file of the menu background ?

I set my desktop background with a video. And the menu background of the Witcher 3 looks like great to me, but I don't know where I can find it. If anyone knows it, I really appreciate.
The first version was found but I haven't found the HoS version.

 

[Gizmo0]

You'll be able to find the file using this method easily.