Swagger Editor[1] can spit out the skeleton of a Flask based server from an OpenAPI 2.0 specification. The generated code makes use of the Connexion famework[2].
Paste your specification into the editor, fix it if it's not valid, open the "Generate Server" dropdown in the top menu, and select "python-flask".
Don't have a blog post for you, but I'm pretty sure he's utilitizing Flask-APISpec (https://github.com/jmcarp/flask-apispec). I've been eying it for a while.
