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I want to make a gaming video. I have the clips and here is the layout:
Can any free PC apps help/do this?
Any NLE can do this: you're simply going to insert/layer an image over another.
Here's how to do it with Premiere Pro (if you have access to that program; the same principle applies to any other NLE though)
There are two ways: 1) as above, set your webcam in the video in post production of 2) record the video with the webcam in, for example with OBS or SLOBS.
Required, but never shown