Specifically for Brazil, in the current situation the country is experiencing, the strongest attention-grabbing trigger would be something related to the money that can be earned on Hive, something like "Did you know you can earn money by posting your stories?".
The large mass of people whose attention can be captured in the first five seconds is generally (in Brazil) looking for a solution to improve their lives.
I believe it's possible to create this video initiative, especially if there's a budget.
By the way, thanks for the mention @shiftrox