The "video" in the background is actually a premade map that plays out. To change it, simply edit demo_attract_kamino.ted.
As for editing music, all music in the game is controlled by MusicEvents.xml. To edit the background music, change this portion:
<MusicEvent Name="Main_Menu_Music_Event">
<Files>UND_Zann_Consortium_Theme.MP3</Files>
<Volume_Percent>80</Volume_Percent>
<Fade_In_Seconds>0.0</Fade_In_Seconds>
<Fade_Out_Previous_Seconds>2.0</Fade_Out_Previous_Seconds>
<Loop>Yes</Loop>
</MusicEvent>
You can also proceed to mess with the soundtrack of the entire game, as I have

Note that Zann uses the Rebel ambient and battle themes.