That video has nothing to do with this. This plug-in is just a sampling strategy to make rendered depth of field less noisy. The video you linked just talks ab

That video has nothing to do with this. This plug-in is just a sampling strategy to make rendered depth of field less noisy. The video you linked just talks about a shot that was purposely made to be an homage to a classic cinematic technique even though it isn't necessary. Depth of field in production computer graphics is almost exclusively done with depth maps in compositing. Because there are many different layers that won't give seam artifacts around the edges as well as floating point outputs that don't clip, depth maps are even easier to make work.