UFO Ovnis Visit Varginha Minas Gerais, Brazil: 26/08/2012

At 5pm on the 26/08/2012, this strange object appeared in the skies of Varginha Minas Gerais, Brazil, in the town of Three Points.  The footage was taken by four teenagers, who were quite frightened.
Could the object simply be a balloon? Your thoughts appreciated on this video.

The dark spot in the sky drew attention. Gradually the clouds, you could see the shape and brightness. flagrant What