How to Frame Your Video: Horizontally or Vertically?
The answer is that it depends how your video will be viewed. If you want something that will look good in a traditional TV viewing experience or on YouTube, horizontal (landscape) is the way to go. However, if you think your video is going to primarily be consumed on a smartphone, shooting vertically (portrait) is growing in acceptance. Below are links to a video discussion by Miriam Ross and a discussion and podcast from Catalina Albeanu of journalism.co.uk.