Is this possible In Unity?

Would it be posible to make something like the thing decribed in this article in Unity?

http://http.developer.nvidia.com/GPUGems3/gpugems3_ch01.html

I don’t know for Unity but,
this is possible in Blender, it will take a lot of time sculpting the shapes for the terrains.

Yes, you can do this in Unity.

As RazorCut said, it most certainly be done with Unity.
Will it be easy? Hell no.

How would you get the GPU to produce it though isn’t all the code in Unity executed by the CPU?

You’d need to pay someone good at this. I doubt it’s a problem you’re going to get a quick answer to from a forum post. It’s an expensive investment for a programmer to do so it’s very unlikely anyone would do it for free. But they’d probably do it for 10,000 dollars in my signature (DX11 contest!)