There's not much that we really know about this footage, except that is does appear to be the aftermath of a car accident, and the license plate indicates that it is not in the U.S. But we do not know for certain if it took place in central Spain or whether anyone was actually killed in the wreck. We have only the introductory text's word for all that.
As for the "ghost", we can definitely see what appears to be an adult male figure, transparent, walking away from the red car to the right and off screen.
But the question, of course, is: Is it a real ghost? Or is it some kind of camera illusion -- or an outright hoax in which the figure was added with video editing software?
Because of the lack of information and detail about this video, I think we have to question its authenticity. But you might have a different opinion. What do you think?