Rubi blogged about his free LowVoltageLabs’ Video Overlay Shield PCB build:
In 2011 I won a free pcb from Dangerous Prototypes, a Arduino shield you can use to overlay and display data on a video stream.
The Arduino Video Overlay Shield is based on the MAX7456 on screen display chip.
The Arduino compatible shield board overlays text on analog video, therefore
it allows easy overlay of text onto an analog video signal, NTSC or PAL.
Just plug it on an Arduino processor board to get started.
The shield is created by Lowvoltage Labs.
I wanted to use it to display the subject line and address of incoming emails while watching tv.
Another use could be a osd system to display flight data on rc planes.
Via the forum.