Sure: with free Teamviewer you can remotely see and operate your Mac's desktop on your phone, so if you can get your iSight cam's image on your Mac's screen, you can also see it on your phone.
But if you don't want the person in front of your Mac to know you're looking at them you had better install 'SneakyBastard' on your Mac and tape the little indicator light right next to the iSight camera. SneakyBastard takes a snapshot everytime your Mac is started up or woken from sleep that you can check when you get home...
But you CAN'T see what they're DOING!
You need Teamviewer for that of course. Without Teamviewer showing on the Mac's desktop!