You can't use it to record into seperate files. However, you can use it to make the necessary editing while recording the presentation. In OBS you can create S

You can't use it to record into seperate files. However, you can use it to make the necessary editing while recording the presentation. In OBS you can create Scenes with multiple video sources. The scene will be the output you see in the video file. You can add the video sources as layers into the scene, scale and move them around. So you could create a scene where the main focus is on the PowerPoint slides and the webcam is just in the corner. The other scene would be the other way around. Then, while recording, you can switch between the scenes to show the powerpoint or the webcam. This does not allow for as much flexibility in post, but it would save a lot of time since you don't have to edit the video afterwards. Also, the audio should be in sync as well.