There's a part of the video where he's on his knees and the nappy looks bulbous - like they do when it's really wet. Also when he's by the door his nappy looks like it's sagging drastically to one side. Chances are, she just hadn't changed him when she took the video. I don't change my little ones nappy the second she wakes up - she normally has breakfast first.
So yes, it probably needs a change but so long as he's not in it all day...
It definitely needs a change, it's so bulging at the front when he's sat down! I'm not saying this is a regular thing, i forget to change my sons nappy sometimes if I'm busy but ronnies does need doing in this video