It's a laser spot on a wall from 100mW DPSS laser in distance of about 150m. I was putting my hand into the beam standing about 30 meters from the wall. You can see two different phenomena on this video.
First one is that moving patterns (I don't nkow how to name it ) above my hand. It's caused by air that my hand warmed and humidified. The refraction ratio of that air is a bit different than refraction ratio of surrounding air so the light beam is curved.
Second phenomenon it not clear to me, I marked it with arrows. It looks like some kind of interference patterns. I think that it may be that indeed. When light passes very close to some solid object it becomes a bit curved in that place. So the laser light that passes near my fingers edges is curved and since then it's way is not parallel to the rest of light. In this situation (when two beams of monochromatic light coming from the same source are projected on a screen at slightly different angles) interference stripes appear and this is what's going on here I think. Do you guys have any better explanation for it?