How can I make a composition stay pinned to a shot so it revealed by a tilt

Here's the workflow that I would use:

• Move down the timeline until the camera starts to tilt up
• Split the footage layer using the keyboard shortcut Shift + Ctrl/Cmnd + D
• Change to the Motion Tracking workspace to make your workflow more efficient
• Camera Track the last part of the footage making sure to spin down the Advanced options and select Detailed Analysis
• When the camera has been solved, drag a selection around as many points as you can in the background eliminating the actor's head.
• Move the target to the top of the frame, right-click and select Create Solid and Camera.
  
   
  
• Right-click on the Track Solid 1 layer and set it as a guide layer (I never use nulls because you cannot see if they track correctly when you preview the shot)
• Make your graphic layer 3D (It will probably disappear, but don't worry)
• Hold down the Shift key and parent the graphic layer to the Track Solid 1 layer
• Select the graphic layer and press Alt/Option + Ctrl/Cmnd + O to open Auto Orientation and set it to Orient to Camera
• If the layer is too small, scale it up
• Press R to rotate the graphic until it is horizontal
• Adjust the Y position of the graphic

All done

 Please use the toolbar or drag your images to the reply field. The "Drag & Drop here..." area is clunky and should not be used to share pictures. It works for sharing project files.