Gait analysis (how a person moves around) is definitely also used these days, so the masks may make it a tad more difficult, but certainly not impossible. You

Gait analysis (how a person moves around) is definitely also used these days, so the masks may make it a tad more difficult, but certainly not impossible. You know how you can tell that a person walking in the distance is your friend, even though you can't see their face at that distance? Yeah, so can algorithms.