Sam is a tattoo artist working with Manu at Realist Ink Tattoo in France (Carling 57).
This kind of tattoo on the fingers is difficult to do. If you don't press to hard, the ink will give off, and if you don't ink hard enoug, il won't last. Sam used first a liner with 3 needles to do the outlines and then another 5 needles to fillin. You'll se that it is very precise with some perfect lines. At the end of the video, you'll see some pics with swollen fingers (and even swollen hand). They were took a few seconds after the tattoo session. Then, the last pic was took the day after.
There's a lot of very good and accurate tattooists, but rare are non arrogant tattooists. Sam is a part of this cool and talented artists.
Don't forget to have a look at Sam's portfolio.
By the way, did you notice that the Unown symbols are a font ?