Use it to look at stuff, or something. Decompile the mod and use EntityExtensibleRenderer for your own purposes, I don't know. It's buggy and doesn't really work past a 10-block radius or so, which I'm currently working on fixing.
I'm so glad mods for this game exist. I'm constantly amazed how this game continues to evolve.
This could be very effective if able to be used in multiplayer. The idea of having camera's to protect your areas or have some kind of 1984 world inside Minecraft lol
P.S. - Is there any way to have another camera block or change the texture that looks like a regular block (wood block or something) but with a hole in the middle maybe? That way it is still able to be noticed if you're looking for it but can be for those that want to have more sneaky approach. Harder to make maybe?