Here is a list of Cantonese videos on YouTube.
Disclaimer: I do not own these videos, nor am I associated or endorsed by any of the content creators. Please pre-screen videos prior to sharing with children to ensure the content and values align with your family.

(traditional Chinese subtitles)
(Cantonese instruction, traditional Chinese subtitles)
(no subtitles, Cantonese instruction)
(no subtitles, Cantonese instruction, some video have no verbal instructions)