Took a few re-reads of your question/problem and I think I have enough of an idea what your struggling with.
Sounds like you haven't set up a new mycameratextureclient to a new name or something or just haven't set it up properly.
So here is the link to the tutorial I used when I experimented with security cameras:
http://www.angelmapper.com/gamedev/tuto ... camera.htm
See the below attachment, which is an example of a level that I created years ago that has multiple security cameras(had to do some searching to find this level on the old redirect). Feel free to do whatever to the level to use in your map. Make sure to take a look at all the settings and see how it was done.
