The video is actually Arsenal fans supporting Coventry fans' songs. The story itself is far too long-winded and complex to go over, but the long and short of it is that Coventry have to play 'home' games 35 miles away in Northampton because of a dispute between the club owners and stadium owners in Coventry.
The owners (Sisu) are mostly to blame, in the end they made the decision and are only in it for financial gain (they are a hedge fund), but it backfired as they grossly misjudged how many fans they thought would travel to Northampton. In the end it has turned into a pathetic personal dispute between owner Joy Seppala and the top dogs who own the arena. The technical staff and fans are being dragged through mud because of it.