Simpsons Chalkboard Open

Hello to All!
I am trying to track the chalkboard like this banksy simpsons open. My track on the chalkboard does fine except when the camera makes a fast move when bart starts to run out of the classroom. My track jumps to the right and starts tracking the trashcan instead of the corner of the chalkboard.
Do I need to exclude the windows by drawing mask on another layer?
Here is the link

Any help would be the great.

Hi there,
Yes, it sounds like you need a holdout shape for the window. You can just track the window on a layer above the chalkboard layer. Mocha treats everything at the top of the layer pile as closest to the camera and at the bottom of the layer pile as furthest from the camera. So it holds out FG layers form BG layers, always.
Cheers!
Mary