Couldn't get much from your video, but it is a 2001 Space Odyssey looking craft type shape with a triangular base, and is most likely a shiny, gray color.
Impossible to tell if this is a craft someone has hidden behind his hay stack, which he tinkers with on weekends, or a genuine alien craft.
Antigravity is relatively easy to develop, (Youtube probably still has the videos) but in the real world, scientists play dumb and say they don't know how to do it.
Since antigravity can be militarized, same old crap that has kept our society back 100 years.