This code preview let you get bones movement from hands.
The easiest way to install the python packages inside blender to be able to use this blend file and run your own pose estimation, is doing this:
go to your blender installation folder, and copy its path
In this example, the path to blender is:
D:\Blender\Blender_exe\blender-2.93.1-windows-x64\2.93
replace the path below with the one in your system:
D:\Blender\Blender_exe\blender-2.93.1-windows-x64\2.93\python\bin\python.exe D:\Blender\Blender_exe\blender-2.93.1-windows-x64\2.93\python\lib\site-packages\pip install mediapipe
D:\Blender\Blender_exe\blender-2.93.1-windows-x64\2.93\python\bin\python.exe D:\Blender\Blender_exe\blender-2.93.1-windows-x64\2.93\python\lib\site-packages\pip install opencv-python