fnunnari from Sign Language Synthesis and Interaction group, shows in this video how you can use your LEAP and your hand to manipulate objects in 3D space inside Blender. 
At the Sign Language Synthesis and Interaction group, we developed a Blender addon to enable the use of a Leap Motion to edit position and orientation of objects in space using hands movement.
Please refer to the following page for details and downloads:
http://slsi.dfki.de/software-and-reso…Sign Language Synthesis and Interaction Group, DFKI, Germany – http://slsi.dfki.de