CCTV Security Bypass Training Needed

I own several small CCTV test-rigs and want to understand, from the ground up, how intruders actually compromise them so that I can better defend my own and my clients’ installations. My focus is the hacking... (Budget: ₹1500 - ₹12500 INR, Jobs: CCTV, Computer Security, Internet Security, Linux, Network Administration, Network Security, Penetration Testing, Security)