I have never heard of a vet requesting video
of any dog behavior, as normally when people bring in seizure
dogs, the vet will keep the dog for observation himself, and so any seizures can be treated immediately. I'm NOT a vet, and you description alone has told ME plenty to give you good advice on this. Back to possibilities: I have seen seizure dogs have their first seizure, pop out of it before the vet could run down the hall, and appear to be fine.