Motion tracking to create paralax in 3D environments

I'm going to be shooting footage on green-screen and I have looked at the Motion tutorial DVD which shows how to motion track where you would overlay an image onto the source footage (it's the one with the sat nav screen in the car). What I want to do is take a person shot on green-screen and composite them into a 3D environment but lock the environment to markers on the green screen so that it moves with the markers hence creating the illusion that the person is in the 3D space. Does Motion have that capability? Also, any tips for removing the markers (since they won't be green) would be appreciated as well.
Thanks in advance.
T x

Howdy,
Sliding the ground plane around until it stays put is a bit too trial-and-error for me, so I usually pick a feature that is on the ground (a green point, i.e. has a high confidence value) and stick the plane to that. To do this, move the mouse over the desired feature, press the spacebar and select "Move Origin to Feature" in the menu that appears. This will snap the ground plane's origin to that feature, which makes positioning stuff in Motion a lot easier.
As for the export, I think there is a bug, of sorts. If you choose to export a Motion project, it creates a project with the footage and camera already in place. The ground plane is lined up with Motion's ground grid and the camera starts off in whatever relative position (X=100, Y=55, Z=-60). If you export a Motion camera file, the camera has the same relative movement, but it's starting position is (0,0,0), which means that the imaginary ground plane for the shot and the ground grid in Motion aren't aligned, and you're back to the trial-and-error when positioning objects.
So here's what I recommend: use the Motion project export. If you already have a project and just want the camera, copy the camera out of the exported project and paste it into your already-existing project, which will keep all the camera values A-OK.
Another thing that is critical: the project settings must be identical. PFHoe bases the tracking values on the resolution, frame-rate and aspect ratio of the footage. So if you track a shot that PFHoe thinks runs at 24fps with a square aspect ratio and and you bring that camera into a 30fps project with DV (non-square) aspect ratio, things won't line up, time-wise or spatially.
As some encouragement, here's a screencap of a simple track used in Motion.

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