You might want to post your question in the Navisworks API forum
http://forums.autodesk.com/t5/navisworks-api/bd-p/600
But don't hold your breath. There are less people visiting that forum than a whore house in a syphilis epidemic.
My experience with the NV API's produced very little results. From what I remember, you couldn't get any reasonable geometry information from objects thru the API, except a bounding box. Maybe if the point is considered a zero-dimension bounding object, then you could technically get the coordinate of the BB for the coordinate of the point.
As for getting all the points, just loop thru all the geometry objects and filter on points. But don't be surprised if that doesn't work.