The notes on the video say that the boats are going out of a river (and over a river bar, presumably, and thus from a harbor) during a flood tide/current, but it looks to me like they're trying to get back into the harbor over the bar during a max ebb (from the water movement, wind direction, and having only ocean behind them, no land.)
No worse combination than shallow river bar, max ebb river flow, and incoming wind from the sea! The wind and current stand the waves up, and the shallow depth makes them break! A Widow Maker, at its worse!
Experienced sailors can see and read the wind, waves, and current flow very quickly from visual clues, and also know enough to avoid situations like this.
The US Coast Guard closes travel over the bar(s) in situations like this, as some people with poor judgment would otherwise try to run it anyway!
This is an "E-Ticket" Ride, where "E" stands for "Exterminator"!
Joe. :teeth :thup