Very simple video editing project

Hello, I need to take some existing video clips and have them placed on the top left corner of the screen frame. So I need for someone to create a video with 1920x1090 resolution and to have the content edited in such a way that the content resolution will be 576x896 (which is vertical) and for it to be located/placed on the top left corner of the frame. That's it!! the rest of the screen should be blank/black whatever.. The video are already edited as vertical.. just need to organize things in terms of resolution and location on the video frame as described. See Image attached for illustration