How to capture high resolution video and capture photo from it in windows 8.1. I am having a UI jumping effect while teied it

What behavior do you want?

It is physically impossible to fit two rectangles of different aspect ratios into exactly the same space without either distorting, clipping, or letterboxing.

In most cases letterboxing (the black bars you mention) is preferred since that will still show the entire video without distortion.

--Rob