Remember FaceRig? It is a wonderful technology that lets you embody virtual characters and show your expressions and emotions. You just need a webcam to get started and record the output as a movie or stream it to Skype, Twitch, or Hangouts. The good news is FaceRig now supports Leap Motion Controller, so you can use the device for hand tracking in addition to a regular camera for face tracking.
To set up your sensor, simply to go Advanced Tracking Configuration section and add it. You can find the DLC for enabling the Leap Motion Controller here. FaceRig is a paid item on Steam.