Use PiP³ to show video from any webcam or HTTP streaming video on your screen, nicely integrated as "Picture in Picture" which makes it ideal for live presentations, screencast recordings and in the educational sector.
PiP³ doesn't clutter the dock with an additional icon: After launch it automatically installs itself in the menubar. Create as many PiP sources as you like and configure keyboard shortcuts to smoothly fade the video in and out. One by one or multiple videos at once.
PiP³ supports built-in and USB webcams, as well as HTTP video-streaming sources.