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Most likely what you've got there is a TV tuner card / driver that puts the video directly into the framebuffer (to avoid the latency of running it through the main bus, CPU and OS). It's keyed to look for a particular color value in what the OS thinks it's putting on screen and replace those pixels with the TV video input.
If that's the case, you could make an equivalent WoW mod if you knew what the specific color value was -- just make a frame and fill it with that color. You can probably find out what the magic color is by opening the DAoC mod without the TV software running and using an app that can tell you what RGB value is under the cursor.
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