This video is about Gobos Plus add-on from SMOUSE. A gobo (short for GOes Before Optics) – in cinematography is a stencil or template placed in front of a light source to create various light patterns or textures.
This Gobos Plus pack looks like it’s absolutely loaded with such stencils that you can activate literally in one click, in Blender. We’re talking over 60 presets, a mix of procedural ones that you can tweak on the fly and pre-animated gobos; all ready to go in Cycles and Eevee.
https://blendermarket.com/products/smouses-everything-bundle/?ref=88 – use a coupon code gleb10 to get an extra 10% discount of all SMOUSE products (for a limited time)

Links and Credits:
SMOUSE Add-ons – Underwater Caustics Tutorial
Image Projection in Blender | Tutorial Part 1
Master Dappled & Textured Lighting in Blender: 4 Easy Techniques
Faun with cymbals by Virtual Museums of Małopolska, CC0 Public Domain
“Mercury about to kill Argos” by B. Thorvaldsen, CC0
“Doryphoros” (carrying a spear) by Virtual Museums of Małopolska, CC0
Julius Cäsar by noe-3d.at, CC0
Statue of Augustus III Wettin by Virtual Museums of Małopolska, CC0
Attikafigur Bass by noe-3d.at, CC0
Herkules und Kalliope by noe-3d.at, CC0
Hl. Benedikt von Nursia by noe-3d.at, CC0