Sometimes in these videos, it’s a little difficult to hear the noise the same as you do. However, I can tell you that I do have a rattling sound from the rear passenger interior area of my car. I believe it is the vent flaps for the HVAC. There is a whole panel of them back there, and they are made of hard plastic so as the air escapes, they flap back-and-forth.
Try turning the climate system all the way off with windows up and listening. Not sure if it’s the same noise you’re getting but it’s noticeable in my car.
Here is a thread on the topic I’m referring to:
https://www.camaro6.com/forums/showthread.php?t=554456