Efficient Pose looks very interesting - it seems to be fast and can generate decent frame rates in "real time". I'm not confident in the accuracy claims compared to OpenPose though, and given that it can only track a single person and is nowhere near as established as Openpose it may only have a niche usefulness. Worth a look though:
I need to check out the more advanced models on pre-recorded data, I've only played with the real-time options and frozen it up trying to run model IV.
I found the installation to be a little tricky, using the method on the git page didn't work for me and I had to do a fresh install of the different packages. It can only run in Python 3.6 it seems, anything earlier or later is not compatible with the required tensorflow etc.
Essentially I just opened the "requirements.txt" file and did a pip install of each one individually. For the Torch I had to remove the edition number to make it work.