Instructions and further discussion are available on nintendo-scene.com forums. Simply burn with clone CD, Boot in modded wii with homebrew based mod programmed with YOASM 1.8. When menu comes up, hit 'z' to unmount, change disc to DVD movie and hit 'start' to play.
Keep in mind that you'lll want to have a modchip that supports Dual Layer DVDs so those of you with homebrew chips will want to use the recently released YAOSM 1.8 firmware.
The application can be download from Team Symbiote Wii DVD Player Beta 1.0.