If you have a second monitor, I recommend having the following screenshots open on it while you work through the tutorial. After watching the video, it will assist you in rebuilding the node network without having to click through the video repeatedly. I've structured everything to be easily recognizable.

You can click on the images to make them bigger!

If you have any further questions, just drop a comment under the video, and I'll get back to you as soon as I can.

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This is the complete and finished Node-Tree:

The first step is to set up the "Cage":

After that, we learned, we set up the Displacement and the custom Nodegroup:

What's inside the custom nodegroup?

And last but not least. The Curve Radius and the Curve Profile: