There are 4 video control options:

Speed 

You can fasten or slow down your video clip by increasing or decreasing its video speed.

Go to the Timing tab and you can use the slider there to control the speed of your video clip.

Video Loop

You can choose to play your video clips in a loop. 

Play full video

Sometimes your video clip is long and you want to switch to the next scene after the captions in this scene.
Other times, you'd like to show the entire video clip irrespective of the caption. You can use this option to toggle this setting.

Both these options are in the Timing tab

Sound 

Sometimes you'd like to mute the audio in your video clip, and other times you'd like it to overcome the volume of the background music. In both these cases, you can use the volume sliders to control the volume:

This option is under Scene > Volume

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