Custom Cursor with Kinect Wrapper

Hello, i am trying to build a little custom Cursor that follows my right Hand. I thought this would be a simple thing to do with the Kinect Wrapper.

Kinect and the little Rainbow Man from are both working fine.

Now i am trying to convert the Position from the Right Hand transform to my Screen Space to visualize a Cursor.

This is the Code for my Cursor. It is somehow working but the Position of my Cursor is way offset from what my Camera is showing.

 var target : Transform;
 var driven : Transform;
 var cam : Camera;
 function Update () {
     
     var viewPos : Vector3 = cam.WorldToScreenPoint(target.position);
       driven.position = viewPos;
 }

Does anyone know what i am doing wrong here?