If your using beta9 just drag the renderer to the second monitor and alt+enter to fullscreen, if your using 8.1, change the renderer setting to adapter 2 and set the resolution and to the resoution you want and make sure the adapter is #2 as well, you then need to set your back buffer size to the same as the fullscreen resolution, and you should have it!
hey, for this purpose (and most other too) dont use video out. use videotexture instead and map the video as a texture on a quad. now you have the full flexibilty to use the quad (or the texture itself) on different renderers, etc…