In that intial video before the "fastmover" comes across the screen it looks like the videographer was trying to see what that small speck was in
the sky...that was a helo...but you are right the "fastmover" was probably a fighter.
I thought that was something on the OP's TV screen...
At least I did not notice it when I was watching it live, but I was pretty far back from the screen. I did see the aircraft fly over live though as
well, and it was pretty apparent it was a conventional aircraft.