Method to reduce/increase speed of a video

Does anybody know of a way to increase or decrease the speed of a video using a trigger in SL2?

Scenario: a car driving along, in first-person view, and the scenery would be recorded. 

When braking, the scenery should obviously slow down, but still be in the same position (so using multiple videos is not possible, as there would be an obvious break).

Not sure if this is possible, but if anybody has any ideas, that would be great.

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