The two men are apparently investigating strange noises. It's not totally unbelievable that they would want to bring a camera along -- strange noises potentially mean a large and equally strange creature, so it would behoove them to get it on tape. As they follow the noises, they start to find giant white feathers, which honestly are kind of out of place in the middle of the forest, seeing as oversized swans and/or geese typically don't go tearing through the underbrush at midnight:

“I was very surprised to find these giant hare-like animals just wandering freely around the children’s play area in Nottingham! They are called Mara or Patagonian Hares, and they are quite big with very spindly legs. They seemed very calm and just nibbled on grass. I guess they can’t be too dangerous! I saw a family of these hares watching steadily at the visitors.” – Ranjit Pol
Approximately 99 percent of "supernatural" videos can be revealed as hoaxes simply by asking "Why was anyone filming this?" As much as Cloverfield and The Blair Witch Project have attempted to convince us otherwise, people usually don't have cameras glued to their faces unless they know someone is about to be shot out of a cannon or something. So that's our question as soon as this video opens:
So what is it? It's clearly a person (or the shade of a person) just kind of jaunting along like a haunted iPod commercial, but what could produce that image on the security feed? A lot of YouTube comments jump to the conclusion that it's a reflection on the monitor, which would make sense if the room the monitors are in were about 60 feet long, and wide enough for someone to stand far enough away to make the appropriate scale and to walk a long enough distance to cast a seamless reflection on all four screens. Beyond that, the screens are stacked, not side by side, meaning the security office would have to be two stories tall and the person casting the reflection would have to teleport from the top level to the bottom level midstride in order to maintain the illusion. Either that or the reflection is being made by a very tiny man.

A headless goddamned ghost appears right in goddamned front of them. You literally see it materialize on camera -- of all the entries on this list, this is the one you absolutely have to watch (here's a shorter version that cuts right to the ghost if you don't have 4 free minutes). Seriously, your mind will be blown like Eric Stoltz's penis in The Rules of Attraction. As they swing the camera lazily through the room, the ghost just walks very purposefully toward them like it's delivering a pizza, while a long, low moan emanates from its phantom lungs.