You can do this on Alerts. Look for the film strip icon. Hit that to start/stop recording - if you're in Alerts, it'll let you know it saved to camera roll. It's really slow, but I'm glad it's at least there. Wish you could trim the clip and export it to your camera roll vs. the way it works now.
I see what you mean ! that's pretty neat. I have a question the green high lighted one play the other ones do not. any thoughts!
That green is just the event color (in BI, right click that camera, General, Event color). I'd check your recording settings in BI for the cameras that aren't playing those clips