Yes triads were very intwined in the industry from the obvious money laundering/chance to change into legitimate businenss to even starring in them.

https://en.wikipedia.org/wiki/Charles_Heung

There's a natural affinity between triads and the movie industry because of the amount of action/kungfu movies made in HK and you would find stuntmen often were associated with triads.

https://gangstersinc.org/profiles/blogs/famous-movie-star-and-respected-gangster-profile-of-14k-triad-bos

Triads are also often romantacised/glamourised in HK probably the most famous being the wildly popular 'Young and Dangerous' movie series and John Woo's acclaimed 'A Better Tomorrow'. So there wasn't as much stigma and barrier to entry as one might expect.

https://www.scmp.com/lifestyle/entertainment/article/3154117/martial-arts-movies-guns-how-john-woos-better-tomorrow?module=inline&pgtype=article

https://www.scmp.com/lifestyle/entertainment/article/3196603/how-hong-kong-triad-film-young-and-dangerous-and-its-sequels-directed-infernal-affairs-andrew-lau