How to resize a screen recording

Good Morning everyone, 

I have done a screen recording which i was hoping would fit a slide perfectly, it doesn't and has a small area of white either side of the recording. This is probably due to the resolution of my screen when recording but i need this to stay where it is. 

I was wandering if there was a way to either reduce the size of the slide or to increase the width of the recording? 

Frankie

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