I have a random CCTV camera I got from amazon, it came with an app system that works on phone/tablet/laptop with a bit of jiggerypokery to make sure it worked. I used it last year for 2 ewes, and it was definitely worth having, although they do have a bit of a habit of finding the blindspots in the stable, no matter how I orient the camera.
I can dig out the exact model if it helps.