requesting assist for specific type of editing to only take part of video (Not trimming)

Alright so to start off I know very basics of video editing overall meaning terms and how to edit simple stuff. English isn't my first language but I don't even know the word for this term in my own language which doesn't help in translating or seeking possible help videos for that.

I am using Premiere Pro newest version.

Now issue I have since I am not really familiar what would the term be for this specific editing or how to do it but I'll try to explain as well as I can:

I have some footage recorded while gaming and I have facecam included in to that same video clip. Now if I would like to start uploading vertical videos for Tiktok or Youtube Shorts I know how to tranform sequence in to that vertical resolution and set it work with my game footage but my facecam (which is in bottom left corner for video footage). Is there any possible way for me to only take the facecam part of the video footage and sort of move it over the game footage so I can put facecam to be at bottom? (I was thinking if I would copy the same clip and rip facecam from there and then place that clip on to a line that game footage would be showing and then move facecam with anchor to bottom so it only goes over bottom black bar)

Basicly like this:

TITLE (Within black bar on purpose)
Gamefootage taking about 70% of the vertical resolution
Facecam taking rest 30% of the resolution at bottom

Resolutions I.E Game footage which includes facecam would be 1920 x 1080 and that turned in to 1080 x 1920 for vertical outcome (Leaving facecam hidden to bottom left from original resolution)

Adding picture also to sort of show what I am asking if I explained really bad.