Car noise when started, goes away within few minutes after I start driving?

Any one can help me? I took a short video below. Thanks!

The car is a 2002 FORD focus. The noise is there when I start the car after
it is sitting there overnight or two nights. It goes away within few minutes
after I start driving.

It sounds like a bearing failing in the serpentine belt path. At 12 years old the car is due for a replacement serpentine belt and tensioner, and the idler pulley (my top suspect) can be checked/replaced then.

However, if the timing belt has not been replaced yet it is desperately overdue and serious engine damage can result if it fails. Be sure to include timing belt replacement in the job if it is still the original.

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