This puzzle features chocolate MORSEls! Three times, the video shows off cookies with suspicious patterns that turn out to be Morse code:

-.-. and .... makes CH
. and .-. (or maybe .-. and .) makes ER (or maybe RE)
... and ..- makes SU

The video also features three clues whose answers can be combined with these three bigrams to form new words:

(1) the lead in a play or movie = STAR + CH = STARCH
(2) a small lie = FIB + ER (or RE) = FIBER (or FIBRE)
(3) a North American freshwater fish similar to a needlefish = GAR + SU = SUGAR

The video indicates that the final answer is clued by these three words and is 12 letters total. Starch, fiber (or fibre), and sugar are the three types of CARBOHYDRATE, the answer to this puzzle.