Topic: Integrating Zencoder tutorial

I'm new to rails and trying to follow a tutorial to integrate Zencoder into my application. In the tutorial, which you can view here:

A section of the tutorial assumes the reader knows what they're doing; which, unfortunately I don't.

What, exactly, do I need to do when it says:

"Now you need to add a method that will accept notifications from the Zencoder service to the controller, which I'm assuming is called videos_controller. (This is also where you'll have your new, edit, create, update, etc. methods for videos, which I'm assuming you are fully capable of creating yourself - you will need at minimum new and create actions so you can upload the original videos)."