Judging from the apparent angle and height of the camera, it looks like an ATM security camera - the Liveleak hosted video DOES start a split second before the collapse.
If it is an ATM camera, perhaps someone was getting cash from the machine right before the bridge collapsed and they don’t want to put the person’s face in the video?
Any one of you locals able to tell us if there’s a bank or ATM at the indicated location?
/consipracy theory