| CPC G06T 19/006 (2013.01) [G06T 7/20 (2013.01); G06T 7/62 (2017.01); G06T 7/70 (2017.01); G06T 19/20 (2013.01); G06T 2200/24 (2013.01); G06T 2207/10016 (2013.01); G06T 2207/30196 (2013.01); G06T 2219/2016 (2013.01)] | 20 Claims |

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1. A method comprising:
receiving, by one or more processors, a video that depicts a person;
identifying a given skeletal joint of multiple skeletal joints of the person depicted in the video that moves less relative to other skeletal joints of the multiple skeletal joints;
selecting, as a three-dimensional (3D) reference point, the given skeletal joint that has been identified as moving less relative to the other skeletal joints; and
tracking 3D movement of the person within the video using the selected 3D reference point.
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