Unity Procedural Mesh Bezier Curve Tutorial
The code is the result of this video tutorial series (german): https://www.youtube.com/playlist?list=PL8XNf8lax18m-RGjWivOpAqaFBqHDQ-X_
Maybe it's already a bit improved ot the original code from the video.
Initialy it was created for Unity 5.4 but most likely it will work also for further versions.
If you can help or improve the script, just fork it a create some pull requests.