This is a badly done piece of video footage. While I don't believe the Earth is flat - it's hard to prove with a shaky video made through god-knows-what curvature of plexiglas and god-knows-what camera lens.
There are better ways to prove that the Earth is round.
How the new moon looks from various places around the world is my current favorite - still nobody here claims an answer to that one - nor to double-tides, shadows of crater rims on the moon - clockwise rotations of stars in the southern hemisphere/hemiplane....etc, etc, etc.
These are things you can EASILY see with your own eyes...you don't have to rely on any external evidence whatever...and that's a "gold standard" level of proof.