Saw a similar video just now over at the evil empire, and found a YT analogue. Apologies in advance if this isn't quite the right community to post to. (already did to "origami" FWIW)

There’s also a lot of styles and possibilities depending on leaf type and amount of effort one might want to spend:

https://www.youtube.com/results?search_query=how+to+make+a+little+boat+out+of+a+long+leaf