Bootvid driver is used to display ReactOS boot animation, NT native console applications, kernel debugger in screen mode, and BSoD's.
Currently we have to boot ReactOS with /NOGUIBOOT flag specified, because bootvid is not adapted for the Xbox.
Xbox have nVidia NV2A video chip that should be used to display bootvid graphics.
Support for it can be added depending on build target, so modifying bootvid CMakeLists like this should be appropriate:
FreeLoader have fully-fledged Xbox video support, so you may refer to its source code: https://git.reactos.org/?p=reactos.git;a=blob;f=boot/freeldr/freeldr/arch/i386/xboxvideo.c;h=bcb70d0ce1083c2cda2d917b556e1d0ad43454ee;hb=HEAD