Here's what The Foundry says about exporting camera Tracker data with the AE plug-in:
We don't support import directly within the plug-in simply because there's some good free AE scripts out there to do such export, and adding such functionality in the plug-in would've meant a substantial chunk of work (and maintenance) which would've driven up the cost of the plug-in.
For Cinema 4D check out the AEtoC4D script here:
http://aenhancers.com/viewtopic.php?t=653
Mark Leonard covered use of the CameraTracker with this script and Cinema4D in his two part tutorial over on AETuts+:
http://ae.tutsplus.com/tutorials/workflow/overview-of-the-foundrys-new-came...
