It's an old clip, comes from about 10 years ago. The guy is actually speaking English, but comes from rural West Kerry, whose people are known to have a very think distinct accent even by other Irish people. Someone in the comments there actually gives a pretty good transcript of what he says
Of a night, there'd be a full moon there of a night, and sure twould (it would) be bright out, and there could anybody go up on the mountains of a night sure! Well, there was 45 sheep missing like, and the lambs and everything, and the sheep does count out to a nice bit of money like! What can be done about it? Nothing! I'm missing about 10 ewes! It's not all that difficult! All you've got to do is have a good dog! Have a good dog, and go at night, and moonshine light! Just put the dog around them, put them on a trailer, or walk them! And then, probably someone else to pick them up!
If you want another good example of a West Kerry accent, here's their most famous politicians,
the Healy-Rae brothers in an interview - the interviewer btw is Ryan Tubridy, the much maligned (following a scandal in which it was disclosed he was received secret payments on top of his already hefty salary) former host of the Late Late Show, who comes from a totally different end of Irish society (a Dublin elite family with several politicians).
