All my attempts to load videos into the video widget from the mod failed.
It is also impossible to load video into MainMenu or loadingMenu from $profile or $saves.
I checked the small dependency:
since my main language is Russian = I use the Windows username in Russian, the path to $saves, which is in the documents in the DayZ folder, turns out to be in Russian.
Apparently, when trying to load a video with the path $saves , he sees that the path relative to Windows is in Russian and does not want to load it into the widget. Tested the same code with a person whose username is in English and everything works fine!