This seagull couldn't care less that a huge hungry shark
is just a few feet away. Maybe it knows it's not a target. Maybe it realized that the moment the shark surfaced either it was too late, or it was fine. Or maybe it just really doesn't give a f**k.
This seagull was just relaxing in the water as they do, while people on the boat in the video were playing around with a lead and bait. Likely trying to elicit the exact response from the shark that they got, the seagull should have been aware on some level that there was a shark nearby. After all, with how accurate the people were with their lead, it's reasonable to guess that the shark had been in the area for a little bit already. And seeing as it was actively chasing the lead, this was a hungry shark.
But seagulls don't really care about anything do they? They eat, crap, and get in the way. Or like this one, barely stay out of it.