FaceRig should not need any introduction. It is a wonderful piece of technology that lets you embody virtual characters and output video to Skype, Twitch, and Hangouts. FaceRig is now compatible with Leap Motion, so you will be able to use your hands to do more with FaceRig.
You will just need a Leap Motion Controller and a simple web cam for hand and face tracking. More information is available on Steam.