Hello,
Ever since upgrading my iMac's to El Capitan 10.11.2 my built in camera's on 2 of my Mac's lock up. When I open iCam pro on my phone, it looks as if the camera is working, but it's not live, it's just the last thing the camera recorded. When I stop and then restart iCamSourcePro on the iMac, the camera becomes live again. This is happening with 2 different iMacs at 2 different locations which were just recently upgrade to El Capitan. It's been happening every day or so.