Hi @ADRIAN BALLE Greetings! Welcome to Microsoft Q&A forum. Thank you for posting this question here.
Here is the underlying source code for Azure Sensor SDK. I could not find any reference to the data in the SDK. I believe the skeleton data used in the Azure Kinect Body Tracking SDK is not stored in a file that you can access directly. Instead, it is generated by the SDK at runtime based on the data obtained from the Azure Kinect sensor.
However, you may use the SDK functions to obtain the joint data and map it to the joints in your skeletal mesh in Unreal Engine. The joint data is provided in the form of a body frame, which contains the joint positions and orientations for each tracked body. You can use the functions provided by the SDK to access this data and use it to drive your skeletal mesh.
Please also note that to use the Body Tracking SDK with Unreal, make sure you have added
<SDK Installation Path>\tools to the environment variable
PATH and copied
Program Files/Epic Games/UE_4.23/Engine/Binaries/Win64.
Hope this helps!