Yes, iCam works with both webcams built-in to laptop and stand-alone webcams that connect to a network either wireless or wired. I have an old MacBook running iCamsource and have 1 wired and 3 wireless network webcams. From my iPhone and iPad I can see the 4 webcams and Macbook's built-in cam.
The key thing to understand iCam is that you need to have a computer ( windows or mac) constantly running the companion, free iCamsource program. Check the skjm.com website for the details.