Can rotoscoping work on text that has 3D tracker applied?

I should have also added that you can roto the door, if you prefer.  The footage remains 2D video, it's just that there is a camera in 3D space.  So if you don't get on with what are nicknamed 2.5D layers, roto is still an option, but you'd probably have to split the roto-ed layer to make it look like the text passed through the door.

Seeing as the 3D tracker has created a 3d virtual space for you, you can simply place the text in 3D space and it will remain. And you can also create a 3D solid to act as a matte for the door.  You'll need to switch to the Basic 3D renderer for track mattes to work (or precompose the door and a duplicate of the camera and separately a camera and text, then use the Set Matte effect).