[Docs] How to deploy body_3d_keypoint models?

[chenzhutian]

📚 The doc issue

Hi, I would like to deploy 3D pose estimation models for inference engine such as TensorRT. How can I do that? I can find documents of some 2D pose estimation models but no 3D ones.

Suggest a potential alternative/fix

If it is too much to write a comprehensive tutorial, any pointers or suggestion will be helpful.
Thanks!