The video likely worked due to its use of a popular game (Minecraft) and a common trope of "clever" base designs that exploit game mechanics to overcome threats, combined with visually engaging on-screen text that breaks down the narrative.
Summary
The video shows a Minecraft player demonstrating a base design intended to prevent zombies from entering. The player builds a structure with shelves and then spawns villagers and zombies to test its effectiveness, showing that the zombies cannot get in.
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Transcript, structure and on-screen text
6 beats, a 26-word transcript and 22 lines of on-screen text — the parts you need to write your own version.