http://alteredqualia.com/xg/examples/facial_expressions.html
http://alteredqualia.com/xg/examples/max_headroom.html
It seems to be working pretty well, results do look nicer than earlier methods which were based on morphable faces [1][2].
See also continuous face reconstruction from video on their project page [3].
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[1] https://www.youtube.com/watch?v=nice6NYb_WA
[2] http://gravis.dmi.unibas.ch/publications/Sigg99/morphmod2.pd...
[3] http://aaronsplace.co.uk/papers/jackson2017recon/