This instantly reminded me of an old argument with Steve Alexander who claimed to have captured a ball of light skimming and hovering over a crop field.
Looking through a pair of binoculars I could clearly see that it was a white bird displaying hunting behavior for food such as field mice. Due to distance it was difficult to identify the exact breed of the bird but due to it characteristic flight behavior I would say it was a barn owl.
What is interesting is that Steve's initial assessment of his sighting is indeed a bird - he clearly asks the question on his video. With poor clarity footage its easy to manipulate the mind of the viewer that its something very mysterious, especially as it was captured near a crop circle.
Anyway you decide !