If you cousin plans to study for six months or less, I think your cousin can study as a "Short Term International Student" . Under this path your cousin does not have to be a Canadian or International student.
Your cousin can study with a Temporary Resident Visa (i.e. a typical visitor visa). And if your cousin holds a valid HKSAR passport, there is no need to apply for this visitor visa.
For admission detail on Short Term International student,
http://www.langara.bc.ca/liberal-arts/step/admission.html |