Interesting to note, the original score has cannon fire at about the 31 second mark of the linked video. Yes, the sound of cannons firing was written into the original score.

The music in the video doesn't have that cannon fire. That cannon fire is one of the most iconic parts of that piece of music. I'm a percussionist and play in Orchestra's, I can tell you that no recording of that piece of music would exclude the cannons. It's that important to the piece of music (and incredibly fun to play as a percussionist, I have played a cannon as a musical instrument).

1812 Overture, war declared between USA and UK in 1812, no cannon fire in this version of the music. War without guns.

You're right of course - I missed the cannon fire, as I'm sure many if not most did.

It's like playing the Stars and Stripes Forever without the piccolo obbligato - cannot happen ever