Installation:

Drop WebVideo.pm in your WebGUI/lib/WebGUI/Macro/ folder.

Then add this line (without the trailing comma if it's the last one) to the macro list in your WebGUI config file:

 "WebVideo" : "WebVideo",

Restart apache and try it out.

Usage:

^WebVideo(http://youtube.com/watch?v=M4-pSxrBMt4);

^WebVideo(http://video.google.com/videoplay?docid=1808273720725631796);

Enjoy.