Office 365 Power Point: Slide Narration --> Webcam Quality Settings

I love the Video-Recording feature in Power Point. Thus I am struggling with it due to the low quality of the video, that is being recorded:

All the videos end up in 640x480 resolution, even if a 4k Webcam is used. Same applies to the microphone quality. Even if the sound is being recorded with a high quality device, the recorded narration is being rendered down. 

Is there a way to edit these settings, that I am missing?