Please see the example below.
I think so.
So the section will come up normally, with the iphone mockup and side text. Once reach the top and intraction would display an iphone mask over the left part.You'd continue to scroll and for each section an interaction would bring a new iphone content (under it). Once the last section in view, an interation would finally hide the overlay, exactly when the iphone uner aligns with the iphone overlay.