Kinect on the Mac uses the OpenNI-Driver structure. The Kinect plugin in Poser uses Microsoft's framework. Those two aren't interchangeable.

I don't have a Mac, so I cannot check, but I don't see any refernces to the OpenNI drivers in the handbook. Also, Windows 7 or 8 is mentioned in the requirements.

It seems as if the Kinect capture feature is Windows only. 

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

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