xm_people is a ROS Wrapper for the OpenNI2 and NiTE2 Skeleton Tracker, which you can use ros node of depth_image when using OpenNI.
With this wrapper,we can run skelon detection ,hand tracking ,visiual slam ,object recognition and face recognition at the same time
- Install ROS in your Ubuntu
- Install OpenNI2 and NITE2
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make sure xm_people in your ROS catkin_ws directory 
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catkin_make roslaunch xm_people tracker.launch
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then you can see the tips on terminal/ and your skelon and hands position are publishing on 'rostopic/people' / you can check it rostopic echo /people
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meanwhile you can check the topic /camera/depth_registered/points and /camera/rgb/image_raw