This man in the video is a very fine artist, but I am not that surprised. Most artist who draw, and paint knows that it is not the eyes they draw and paint with, but the brain.
I teach basic drawing, and when adults are going to learn how to draw, they have a hard time. If you ask an adult who haven't been drawing since childhood, to draw a portrait of another person, the drawing will look like the drawings they did as a child. That is because we store images in our brain. My students will look at the person, but the drawing they will produce will be a drawing of the face images they have stored in their brain from their childhood, and not a drawing of the person in front of them.
One of the ways to teach people how to draw a face, is to ask them to touch the face, and feel all the curves. That will create a map in the brain that will make it possible to draw a more realistic drawing.
The same goes for colours. some people has a hard time understanding how to mix colours, but if you ask them to put words on colours as warm orange, and a cold blue, they start to create images in the brain of the colours attached to feelings. That helps some people to learn how to mix colours, because they can find the colours in the brain, and then mix them in their mined, and not on paper.
The artist on the video is doing the same ting, he is creating images in his brain. He use his fingers, and perhaps he is also using sound to create a map of the world in his brain, that he can paint from.
I have a blind friend who can tell distance from sounds, so he is not living in a flat world just because he is blind, and never has seen light, he knows that the world he lives in is 3D. He also knows all the colours and he said to me that he can see colours in his mind.
Sorry I go a little carried away here :)