There has been a lot of discussion concerning this subject, I'd like to clarify things a bit.
Standard NTSC video cameras capture 29.97 fps (about 60 interlaced fields per second (1/60 shutter speed)) and PAL camcorders capture 25 fps, at 50 interlaced fields per second (1/50) shutter speed. Frame rate is not a question of quality, it's a question of geographical situation. Ex: Canada is NTSC, UK is PAL.
To see or not to see a muzzle flash on video (or any brief light source) is not framerate-related, it is determined by the exposure ratio of a single frame (shutter speed/framerate); a 50% exposed frame, as in video, will not see a flash if it happens after 50% of its length. Even less if shutter speed is higher. Trust me on this, my daytime job is camera operator.
And the human eye is very likely to see absolutely all light, even breif ones, as each cell in the retina is "refreshed" randomly(you can trust me on this too, my mom's an ophtalmologist). I'm sorry about my poor choice of words, but I'm trying to make it clear.