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In the video embedded in the article, in addition to the musician playing the octobass, there are three other performers; they all seem to be playing some sort of double bass that seems to have perhaps 6 strings? The shape of the pegbox is unconventional. I've never seen such an instrument before, can someone explain what is it?

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It's a C-extension. A regular bass goes down to E1, but the C-extension gives it a couple more notes down to a C1.

Oh, thank you for explaining that! I found some pictures, and I now understand how it works, those are not extra pegs as I thought, they are basically something similar to a guitar capo.

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