getting tracks from 3d geometry

Hello, I was wondering if I have a matchmove camera and geometry (let’s say even just a cube for example) and I want to get a 2d track from let’s say one of the vertexes of the cube, how do I do that? I know I could use the "points to 3d" node which I have tried and works well (and doesn’t require geometry), but what if I have geometry and want to just get one or more tracks out of it to use in the 2d environment? thanks!
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