The worm in the video is colloquially called the horsehair worm (though the English animal name is “Gordian worm”).
The eggs of the parasite are laid and latched onto plants in the water, and bugs that feed on the plants digest the eggs too. The eggs hatch the stupid parasite bug, and it can’t breed because it’s stuck in a stupid petty insect. So what the parasite does is control the mindless insect to be fatally attracted to water which is the optimal breeding area for them (insestual probably), and when they sense any sort of water they shimmy out of their anus I think.
I think mind controlling parasites are cool because I love petty stupid insects getting dominated.