I'm trying to write an app using Maui, but I haven't found the relevant function of how to play video in Maui. How can I implement it？
As per discussion over here the video player is not implemented yet. There is a plan to include one in the community toolkit in the future. All the third party packages which have support in Xamarin.Forms are still not ported to Maui. You can try Xamarin.CommunityToolkit.MauiCompat which is a clone of Xamarin Community toolkit adapted to work with Maui.
You can also try Webview or Maui Blazor Webview to play Video in the browser.
Here is a repo of someone who managed to create it:
4 people are following this question.