This new trend is not related "directly" to fashion, but instead it is linked to the tech world.
The first time I saw this kind of video was thanks to Eva Chen during NYFW, by the time of MFW every fashion brand/model/designer/influencer... was using it!
You probably are wondering what it is? Simple, it's an application that permits to add different types of sparkles on your pictures and videos. You just need to scroll through the one you like and click.
Here all the seven types: