A better option instead of reverse engineering old software would be to make a video player. In fact, one already exists, you can find it here. Not sure how you could swing downloading videos from Nintendo, though, but this would work for your own content.
At This point you are screwed read the WiiBrew article for the Brick. It tells you that if you didn't have Priiloader or BootMii as Boot2 it is the hypothetical equivalent to a full brick.
First off, Homebrew (CAN) be piracy although most of the time isn't. And you would need to format the SD card unfortunately delete homebrew then reinstall it using Letterbomb, Flashhax or any other exploit with the hackmii installer on 4.3 .
Ah, yes, portrait mode, surely the best way to film a row of people. If only there were some way to fit a wider shot, at the expense of height... if only...