VLC media player is advanced multimedia software capable for reproduction of almost all media files.
Sometimes notification popups could be very anoyed takeing away your attention so here are steps how to turn it off.
1) Go to Tools > Preferences
2) Under section "Show settings", on the left lower corner, select "All" radio button
3) Go to Interface > Main interfaces > Qt
4) Uncheck "Show notification popup on track change"
5) Click "Save"
After settings are saved you should restart VLC player and popup notification with song name displayed is gone.