A Youtuber that records jookin (a mid-South form of dance) uses Gaussian splats for his videos to bring the dancers out into the forefront and hold center stage, it's a neat trick.
https://www.youtube.com/watch?v=k0MGoFaIiWs - WARNING - heavily adult lyrics and a loud starting "MOTHERFU*AAAAAAS" right off the top.
That doesn’t really look like Gaussian splats to me- but this video, Helicopters by A$AP Rocky, uses the technique well:
https://youtu.be/g1-46Nu3HxQ?si=y_u257DzgOg2QV83
What makes you say this is using Gaussian splats? It looks like simple motion-based cropping to me.
Because I know the video producer and have talked about this in-depth with him.