Unable to add a video to the default project.

hi, im really new to Tauri and rust in general, so as a small project i want to add a video that will appear when you press the "Greet" button on the default tauri project, however when i added the video component inside the html file with a source for an mp4 video, it only shows me the video screen without anything in it, do i have to do something first to make this work?