Hello sir, im a Nigerian but presently in Turkey, do i need a visa to go to hong kong?

Yes, but I am not sure if you can apply for it in Turkey or not (most embassies do not accept applications from temporary visitors/non-residents). For HK visit, you should provide round-trip ticket, hotel bookings, financial support, for example, a bank statement for application.

thanks fo your reply, but please i want you to help me confirm if i can get it in turkey..please

Sorry, you may need to contact the embassy directly. You can apply in Turkey if you have document showing our residence status, employment or student status, or other valid certificates of legal staying.