How do we know the user denied access to Local Networks access?

Thank you for the response. Well I can always implement and compare, but implementing the most optimal strategy and finding the most optimal set of instructions may be hard in a multilayer setup with so many visual element types. If we just keep black video(1 frame of size 480x320 stretched to fit timerange) in the below layers of passthrough tracks, will the decoder have any extra hard time decoding the black videos? In other words, passthrough track + black video vs passthrough track, is it any different?

Well I already mention app name, but still they rejected. I could go longer by saying <Appname> requires microphone to record audio for video tracks. Without this permission, video clips would be silent. But this becomes unnecessarily long and confusing. I checked tons of other video camera apps and they write stuff such as "this allows app to record audio". The thing is in a video camera app, isn't it obvious that microphone permission is needed to record audio?