Red & Black are PRETTY MUCH always the Transformer Pwr (12v delivered: (9V DC working...Red is positive)).
So the video should be your yellow & blue/
(I thought green (but what do I know)).
ImageSensor:1/3"ColorCMOS, VideoFormat:PAL, EffectivePixels:628Hx582V
Min.Illumination:2Lux, Lens:6mmF1.8, ViewingAngle:Diagonal53?
I have every confidence your cables are going someplace EVEN MORE COMPLEX you have not even mentioned. You really need to share that BEFORE DEFINATIVE answers can be given abort ONE end of your cable.
The primary question
Are you using Philips/BNC (cannon-PWR)/ connectors or the RJ45 type... using individual power transformers or Power Distribution panel... Direct to a video screen (TV monitor).. or a NVR real-time matrix... or DVR recording system
Comment back if you are serious with configuration information... If I don't know your answer straight away I can get you pointed in the right direction.
Required Pin-out, nvr, dvr, resolution, compression, remote, IP
lorex sg6157 wire pinout Bing images
Lorex SG6157P Specifications