My Story: This story happened to my friend. I formerly work at escape theme park for 6 months and this incident happened to my friend when i was quite new.

My friend was operating the panasonic alpha-8 at that time. There were no customers at that time when he saw a lady dressed in white in one of the infra-red camera monitors. (the place was dark so the company install infra-red cameras to help operators see any stuck cars in the dark)

She was walking on the tracks close to the unloading bay. My fren instantly turn to shout to her to get off the tracks but nobody was there. He look at the monitor again and he saw a floating head which disappear into thin air after a few seconds.

I also saw some small balls of lights at the monitor when i operate alpha-8 but my frens say its just dust caught by the camera. Or is it?