In regards to answering the question about how to set up video camera's, its pretty easy... but then again, I am an engineer (computer geek). You need to first buy some hardware called a Network Camera (or IP Camera). Go to
www.axis.com, and click on network camera's for a good selection. I use the Axis 207, but there are many other varieties made by other manufactures. If you have a Macintosh, I would especially recommend AXIS camera's.
They come in many flavors and types. You can get fancy high def network camera with motion detection and manual controls (they can get pricey!),or for a basic pet cam, a lower end network camera like the AXIS 207 works well. You can buy wireless network camera's (you can tell because these have the little antenna's on the side), or the cheaper network camera's that you have to wire (via a ethernet cable), into your wireless router (if you have that luxury). You pay more for the wireless camera's, but they are more flexible (though the resolution may suffer a bit). I have my router next to the turtle tank (and my router has spare ethernet inputs), so I just plugged my two cameras into my router, and then configured their IP addresses on my computer.
The user manual tells you how to get your own unique IP address for your network camera which is basically a mini server. From there, you can customize your own web page (like I did), or use the simple software tools that come with the camera's to build your web page, to display your camera image(s).
This all probably sounds like a bunch of gobble-de-gook if your not into this stuff, but its not all that hard to figure out.