Any app for surveillance between iOS devices?

Searching both these forums and Google in general, most of the results give me the ability to access web enabled surveillance feeds around the world from my phone, or the ability to use my phone as an external webcam for my Mac, or a simple sound-triggered video recording app, etc. but nothing quite what I'm looking for.

I'd like to use my old iPhone 4 as a live streaming camera that I can place in a strategic location, and then be able to view the live video feed on my iPhone 5 or iPad or allow my colleagues to do so via an app on their iDevices. If it's possible for multiple iDevices to be used as cameras (I'm sure we have plenty of iPod Touches or old iPhones among us), even better -- but not necessary. We'll generally be in reasonable range, but we also have Wi-Fi in the building. It will be plugged in, so no need to worry about battery.

For the record, we're teachers at a band camp, and I want to set up the iPhone 4 so that even when we're inside the staff cabin planning, relaxing, or whatever, we can see if kids are sneaking around the staff cabin when they're not supposed to be. Then we'll know to bust out the water balloons.

Anyone know of an app that can do this? I can't seem to find the right search terms... assuming one exists.

 

Hmm, looks like that only does photos? I'm looking to stream video.

So far, the most viable option I've seen is setting up the phone (camera) to broadcast to Ustream or something, and then just use Safari on the other devices to view the broadcast online (since, again, we'll technically have Wi-Fi).

My main concern with that, though, is that it's such a public website, and these are high school students/parents/staff we're talking about. I know I can adjust the privacy settings, but still... if there's a dedicated app and service instead, that would be preferred.