I wouldn't do it, not practical, but I also don't find anything really wrong with it (don't find it all that cool either, its predator and prey in a small box afterall) aside from certain health concerns. I know this isn't going to be a popular opinion, but Just because its "cute" doesn't mean it has a more innate right to live then anything else.
Ducks are prey species for a number of predators, and anything baby is prime prey for any predatory species. sure, pellets are available, they MIGHT even be of better nutritional quality then live food, but I tend to think predatory species should be given the chance to be predators on occasion, forcing them to live solely on pellets might be almost as cruel as keeping them in a glass box and doesn't this site consistently preach variety of food? (I know I wouldn't want to eat scientifically determined recipe of stir fry with tofu every day for the rest of my life. might keep me alive, but I am not going to enjoy it) Anyone ever eat roast duck? fois gras? veal? suckling pig? Eggs? Over in many asian countries, that duck could have ended up on the menu for a dish in a fine restaurant that same day, in fact ending in an arro's mouth might have been a better fate then say a fois gras goose.
now, putting it on youtube? that was just dumb.