It could be the bearing in the alternator or other component. You may want to remove the drive belt and check each belt-driven accessory for play in a bearing or noise. Looking at the belt routing diagram (pic below) I see a belt tensioner, A/C compressor, and an idler pulley below and beside the alternator.
When you get back, let me know what you find. I would likely use a stethoscope.
Listening to your video, I have a feeling it's coming from the alternator, but listening to a recording could be throwing me off.
If you have a chance, let me know what you find.
Thursday, September 30th, 2021 AT 6:02 PM