The chances are the foal will be alright, but.
I have two cameras with sound, two foaling alarm halters, (I use Equipage, there are less false alarms with that one, it does not go off unless the mare is flat out).
If you just rely on camreas and check every so often, your mare could foal without you. I had one mare last spring that I just could not wait for her foal, her full siblings, two of them, were AMHA World Grand Champions. She is just as pretty as her siblings, but on the smaller side. Only 29" (if that). She was in foal to my new stallion, an L & D Scout son: Fallen Ash Scouts Prince Of Tides. Anyway, I watched her like a hawk. Got up early one AM, she was doing nothing but standing quietly in the corner, as she had done all night. No fussing, nothing. Stupid me turned off the alram. I went into the den to my computer for 10 miniutes. Got up to look at the camera again, and there was a dead foal in the stall. A beautiful bucksin filly (of course).
What I am trying to say is that a camera is nice, but it will not tell you if the mare has gone down to foal. The sound fromt he camera, well that picks up so much noise from all of the horse, that you tend to either be up all night because of the noises, or you tune it out and sleep.