We don't have a full step by step in depth tutorial on how to integrate Vuforia in a new (empty) iOS project; if you wish to have such tutorial, you can post a request in our wish-list:
however, as a geneal note, we recommend to start from the existing samples, study the code and learn the Vuforia API used in an application;
the Cloud Reco sample shows how and when to initialize Vuforia, how and when to initialize and start the Camera and the Tracker, how and when to stop the Camera and the Tracker, how and when to initialize a TargetFinder (the class used for Cloud Recognition), how and when to stop it, how and when to retrieve a recognition result and its metadata, how to integrate an OpenGL view to render the video background and the augmentation models.
All the building blocks are there in the sample code.
The developer guide, the getting started guide and the API reference are also there to help you.