There's a few interesting things about this video. First of all, I don't know how to define the riding style - it's a mix between MTB street, trials and flatland - all I know is that it is amazing and very refreshing. I'm assuming Marko and Nikola are brothers, which is also nice. Secondly, it's filmed in Dubrovnik. I honestly haven't seen much riding come from down south, at least not lately, so this definitely adds up to the fact that this is something unusual.
Make yourselves a favor and watch this. You won't regret it!