Jwin JVTV2042 Security Monitor w/ Cameras Television "camera hook tv" Questions

...camera the tv wirk find if I hook it up to dish net work. the power supply is a 2 amp 12 volt system and using wire with bnc connections with and adapter to coxial fittin of tv Is the HD CCTV camera ...

...tv. Yet, when I hook it up, I get no picture at all. Any help would be appreciated as I have two neighbor boys throwing dog poo in my pool and I want to catch them red handed. As am not conversant ...