AR for iOS6 using vuforia

I made an AR contents using unity(3.5.6) and vuforia for iOS6 but it doesn’t work well.
ARcamera work well but I can’t see 3Dcontents.Does anyone know there is any problem between unity and iOS6?
And I would like to know a good tutorial.

Vuforia web site has a tutorial video already, have you watched it before?

Here is the link :