Videos have to be uploaded ro YouTube or Vimeo with a link posted here. I would suspect one or more of your hens or rooster is cannibalizing (vent pecking) your chicken. Sometimes a hen will have a little of the cloaca to prolapse, and when a chicken sees red, they will peck at it. But sometimes chickens peck at vents or feathersif they are overcrowded, not getting enough protein, or boredom from not getting outside to free range. You need to watch them to find out what is happening. Do you see any chickens with blood on their beaks? Cameras in the coop are good.