Hand and head tracking in VR is a work in progress. A bunch of companies are working on these technologies. uSens, which has been developing hand-and-head tracking technologies for AR and VR, has opened its SDK to developers. With the uSens Fingo, developers can add 26DOF hand tracking and head position tracking.
Power Fingo has its own battery and Qualcomm Snapdragon processor. It enables developers to come up with more immersive AR and VR experiences.