# How to add a background behind a video?

how can you add a background image with a video in Blender?
I would like to use a video from the screen of my phone (the size is in "portrait" mode), and add a background to fill the rest of the screen, so that it can fit the size in youtube.
Thanks

Edit: here is a good video that explains how to proceed (videos 11 and 12) : https://www.youtube.com/watch?v=x_dy4yMSJSw&list=PLjyuVPBuorqIhlqZtoIvnAVQ3x18sNev4&index=12

• For me, putting the Color Strip Above the Video and choosing the Blend mode of Alpha Under worked. – Sayyor Y Mar 17 at 9:24