proevoking

Hi, Im new to cctv wiring... There are some pre-existing cable in my home and im guessing it is RG59 cable... when i go to remove the old camera there is a power cable and another black wire that has been stripped and has the colours red black and yellow onto some connector which then connects to the old cctv camera. My question is... i want to install new HD cameras can i use the exisiting wiring for this... or would i need to get different adapters for this or would i have to rewire? Thanks

Thanks for the reply but im even more confused because the old camera has a power cable then it has black cable which is stripped to black yellow and red and that is connected using an FPV connector onto the camera, there is no bnc/balun connectors... so i was wondering how would i go about new installing the new type of cameras Sorry for the confusion im new to this