Yes, I am aware of such technology - they announced similar capabilities in our existing surveillance system. I know that it is most likely not as advanced as China’s, because that’s how it usually is here. However, it is not clear just how good it is in practice - at least in some cases, they’ve been overselling it (at least in regards to recognizing obstructed faces). So I am not sure just how dangerously accurate said gait recognition is, especially since they have much better facial recognition to depend on.