Get the belt off, then check the tensioner pulley and the idler pulley for ANY play or noise when spinning them by hand.
If they are OK, check the black shiny water pump pulley same way, no end play, no up/down play and no noise when turning.
If that is OK, then maybe the alternator, PS pump or A/C pulley.
Also eyeball the crankshaft pulley when running for any movement ( the rubber dampers inside can deteriorate ).
From what I could see in the video, the crankshaft and water pump pulleys looked OK.