Very cool gearbox based on a build on brickshelf by user sariel with a few differences.
The wheel is not on the output side, its the yellow tip where the gears move that gets the gear reduction
If you want any of the parts on the video check out the links:
Lego Technic Parts
amzn.to/4bVmYlh
Lego Technic Motors
amzn.to/48nDLtW