If you move the mouse to the top of the video display, a menu bar appears on which you have access to some options, it disappears by moving the cursor back down. When you doubleclick on the video display you toggle show control bar/hide control bar.

Here a short explanation of the buttons on the control bar from left to right

Previous video on the playlist

pause/play

Stop

Next video on the playlist

Mute

Volume Control

Show playlist

Current play time / Total duration of the video