I dont have any vid, but for my cannons I used compressed air, fog, lights and a 12" 450w subwoofer.
Basically, the fog machine would just run every few minutes to refill the pipes / reservoir for the cannons, the compressed air would open via a sprinkler valve while the light flashed and the sub fired off the boom. this would cause the cannon to create a smoke ring/blast lit by the light and shake the ground with the sub.