Short version: You will normally use The Homebrew Channel to boot Wii Homebrew.
Instead, you’ll find lots of information at Wiibrew.
Since this post is primarily about the DVD player in particular, and assumes that you are at least familiar with the usage of homebrew software on the Wii, we would appreciate it if you avoid asking general questions like “How do I run this on my Wii?” in the comments – replying to these questions is very hard and clutters up the already long comment list. Welcome! We hope you enjoy the wonderful world of homebrew software.