I would say ""유튜브 동영상(을) 보고 있어요" is better.
영상 means an image or picture (영: projected, 상: image), so is more appropriate for still images.
동영상(동: moving) is specifically for videos.
February 14, 2016
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"유튜브 보고 있어요."
February 14, 2016
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