Kinect version 1.8 detect problem

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C#

Kinect

I have some problem on my project.
First, i want to create a program which can detect skeleton tracking from video clips.
Second, how to measure angle after skeleton tracking.
Third,why Kinect studio cannot show me skeleton tracking function.

What I have tried:

i had use Kinect studio to record my motion,but it still cannot show me skeleton tracking.