Maybe someone actually remembers this addon from way back in 2005. What it did was it allowed for you to view video while playing WoW by exploiting how video overlay works.
What this addon essentially does is create a resizable colored frame that in options would let you change its RGB value as desired. You then place the video being run in a program like VLC under this frame. If the frame is set to the correct RGB value than the video shows through the WoW client.
Now that I've started playing WoW again, I was going to try to find an old copy of the original addon to try to update it to this patch. However, I can't seem to find anywhere with the old source files. Does anyone know of an alternative or perhaps even have an updated version?
Supposedly the addon broke back in 2008 after not being maintained for three years.