To be more specific, the plan is to have an interviewer (video 1) and an interviewee (video 2). When the interviewer is interviewing someone, the 2 videos will be in boxes (which I can do), but when they are not interviewing someone video 1 willl be fullscreen.
When in the boxes, the videos will be 1:1 ratio (cropped square) but when fullscreen, the video will be 16:9.
I am basically looking for a way to transition neatly from the small video to the larger video.