Slidev has a built-in recording and camera view. You can use them to record your presentation easily in one place.
Click the button in the navigation panel to show your camera view in the presentation. You can drag to move it, and use the handler on the right bottom corner to resize it. The size and position will persist in
localStorage and will therefore be consistent across multiple refreshes, so no need to worry about that.
Clicking the button in the navigation panel will bring up a dialog for you. Here you can choose to either record your camera embedded in your slides or to separate them into two video files.