How does Vuforia works in Unity ?

I just imported vuforia for android unity packages into my new project but I dont know how I make one of the scene to work and what I am supposed to do.

I’m looking for a tutorial please. Or at least a short explanation.
I actually want to do some tracking with markers for example.

Regards,
sRodelb

Yes, it does. Please import main package and image targets package (which contains sample scenes).