roto shapes linked to 3d objects

Lets say I have an animated object that was rendered from the 3d dept. moving around the frame, X & Y only. I want a pass that I can hook a roto shape to, so that my roto shape sticks to the movement of my animated object.

Would a position pass allow me to do this? Some other type of pass?

Thought about linking a 3d tracker object, and rendering that out, then tracking that marker in Nuke, but would like a more integrated workflow, if possible.

Any ideas?

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