I'm a newbie in video editing. Here's what I do:
- I record the screen of my phone, explaining some stuff
- Video is recorded in portrait mode, thus it's a vertical video
- I edit this video by adding some pictures or audio effects and post it
- However, the video is vertical and added pictures block the real captured phone screen
Here's what I want to do:
- Recording the screen just like before
- Somehow shift this vertical video to the left of a new video
- Add pictures and other marks to the right in the editing process
- Export the whole as a square video
In fact, I want to do this:
I don't know what keywords should I use in search to find guidelines on how to do this. I don't know what software (preferably free and open source) can I use for this. I'm stuck at this point. Can anyone help?


