The yellow wire in the security camera is related to video data transferring and is known for positive wire. However, the yellow wire inside the black is 99.9% coaxial. These are two wires and are electrical wires, and are made for DC 12 volt positive current, and are called positive cables.
How do you splice BNC cables together?
https://www.youtube.com/watch?v=0m2dnGFBqR4
How do I extend my security camera wire?
https://www.youtube.com/watch?v=f2G2KE0WjDg
How do you splice video cable?
https://www.youtube.com/watch?v=BhQAule4exI
Can CCTV cable be joined?
https://www.youtube.com/watch?v=LfWBjRnoDuo
What wire is used for security cameras?
Security Camera Cable Information and Installation Instructions. The two types of cables used for the installation of Security Cameras and Digital Video Recorders (DVRs) are Plug and Play Cables (PnP) and RG59 Coax Siamese cable.