This ghost video was captured at Yaynol Park at a church (UK). One of the ghost investigators is overcome by either ghost possession or oppression. In either case, the person becomes disoriented and if possessed, loses control of the body. Read more about Ghost Possession for explanation about this phenomenon.
Camera man James has to be removed as he cannot walk or talk properly due to being overcome by the ghost presence. This is an example of ghost possession or attachment, the influence of the spirit being strong and taking over the actions of a living person.
Some people are more easily overcome by ghosts that intend to possess human bodies. The use of alcohol or drugs can make one more susceptible to such ghost attacks.