VGA is still an analogue format. If you're going analogue cable into a tuner and coming out VGA, you still have an analogue signal going into the cctv router. That is fine, just keep in mind at some point you will need to convert to a compressed digital video format of some type, as mentioned by udayan above.
Have you tested the cctv router you plan to use? Does it already take an analogue signal in and stream it to a phone? I guess we'll need to know more about the cctv router's capabilities. What part of this are you actually developing? Also, does your cctv router stream audio, or just silent video?