It really depends on your language skills. I assume you don't have any Cantonese in which case its going to make it difficult. The loacl English langauge stations TVB, ATV are unlikely to take you on without local langauge and/or knowledge. They are certainly worth a try but by all accounts they are famously difficult to break into.
Your best bet directly is to try the Discovery Channels they have quite a large presence out here, although I'm not sure how much production they do.
Out of your area slightly but CNN also has a large presence out here and carries out a good bit of production.
There is also the oppurtunity to freelance as their is plenty going on in the region, but that leaves you with the problem of a visa.
www.jobsdb.com- has a good range of media jobs that you may be able to apply your skills to and if your lucky you may even find the job you want
Hope that helps and good luck