Looks like a ghostly image/recording to me. Do you know the location?
As Jenn says it's Berkeley Castle in UK. The question that always assails me in these cases where an entity of a certain "epoch" is apparently seen (speculating that it could be the middle age, or whatever it may be), is whether it is a self-aware entity, that is; "Oh I'm a knight riding to my castle" and interacts with others at a conscious level of their "medieval reality" or it's just the remnant of something that happened in another time. Well, are the rational questions that come up against these fascinating mysteries
In this case that I explain below it is more or less clear that he is a person who would have just "left his body", and who also his friends at the time of the accident "felt" him around.