Unusual object in Argentinean Air Force display

According to the famous ufologist, Andrea Pérez Simondini, during a show organizing by Argentinean Air Force, a black disc-shaped UFO is appeared near airplane! Several persons have seen this unusual spectacle…

Simondini wrote:

"Several things happened on 11 August 2012, during the 100th celebration of the Argentinean Air Force at the Córdoba Air Base. The public was treated to a lovely display of aerial acrobatics, there was a brush between two aircraft without any consequence to the pilots and and incredible recording was obtained: a video taken by one of the participants.

Here is a vidcap from the document. We will see what it's all about, but at first blush it's intriguing."