Add button to jump video back x seconds

Hi

Due to lack of results when searching this forum, I fear this simply isn't possible, but does anyone know a way of adding a button or other feature to a slide in storyline that allows you to jump back a number of seconds in a video?

I'm designing a transcription task so have video on a slide alongside a text input box. 

I want learners to be able play/pause the video and use a keyboard shortcut to jump back by 1 second. Or Play AND jump back half a second would be even better.

Perhaps there is some Javascript magic that could do it? (pardon me, I just dropped all the straws I was clutching...)

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