How to properly use the pathfinder tool in Illustrator?

I am currently trying to learn a bit about illustrator, and one of the tutorial I am following mentions the use of the pathfinder tool to intersect 2 objects. The goal is to add a splatter on a text following these steps :

-Copy and paste your text in the same place (ctrl+c, ctrl+f)

-Add the splatter above it, select the splatter and the second text

-Go to pathfinder -> intersect

But when I do that, nothing happens. So, I made a video of my screen to show you what I am exactly doing, maybe I'm not using it right. For video purposes, I use 3 different colors on the different texts and on the splatter. Also, don't mind the font I should have used another one for the video.

Here's the video