If I understand you correctly your setup is something like this... ISP router >>>> L3 switch vlan1 all devices -- vlan2 cctv >>> other switches with correct vlans and trunk ports configured (hopefully).
1)First of all make sure your vlan2 is accessible from switch to switch I would setup a laptop with the ip range of vlan2 connect it to a vlan2 port and test each switch and ping to a know good cctv device ip.
2) Keep in mind you are dealing with L3 and L2 routing, vlans are L2 if you want inter-vlan routing then this will have to be enabled on the last switch before your ISP router... I suspect the cctv recorder will be on this switch. [i call it the core switch]
3) Personally I would not use the same ip range as your default network pick another i.e 172.16.x.x up to 172.31.x.x to give a physical separation of IP ranges this way you will not overlap with your /16 subnet. since you have a L3 switch before your ISP router you can use this switch as your default gateway for any device on your network.
4) Using this method you could have as many vlans all using the last switch [core switch] before your ISP router as their default gateway and this switch will forward any traffic bound for the internet to the ISP router. If you want routing to all your new vlans then the inter-vlan routing of this last switch would have to be setup up to reflect that. This way you will be able to access any other vlans ip range from your core network IP range, since all devices in your new vlans will be using the core switch as default gateway no static routes will be required on any outer devices all the magic happens on the core switch.
oh remember all uplink ports from switch to switch must be trunk ports to carry vlans.
assumed network topologies
ISP router >>>> L3 switch >>>> switch >>>> switch >>> switch [vlan2 port 5 <<< cctv cam1
(this topology is the best option)
_______________________ |>>>>>>> switch
ISP router>>> L3 core switch|>>>>>>> switch
________________________|>>>>>>> switch [vlan2 port 5 <<<< cctv cam 1
I hope this information helps point you in the right direction, Good luck.
