Mediapipe is impressive. It is much faster than OpenPose and Wrnch and usually self-reports 100% accuracy, even for hands. It even runs on smartphones. For an example of python programming with Mediapipe see: https://www.youtube.com/watch?v=EgjwKM3KzGU
A good start on a Mediapipe plugin for Blender is at https://github.com/zonkosoft/BlendyPose This plugin worked well with Blender 2.92 but has a problem with changes made in 2.93. The developer is asking for contributions to the code.
Python code for Mediapipe import via another Blender plugin is at https://github.com/carlosedubarreto/b3d_mocap_import/files/6602077/ESQUELETOOK_mediapipe_blender_v1.zip
It seems that with adaptation this code, which calculates x, y, and z bone information, could take the landmark data from BlendyPose and convert it into a .bvh file for easy use in Blender.