Split HDMI

The idea is to interrupt thorough HDMI a signal. Currently there are two apps running on android box 6.0 PRO. The box is connected with a Screen via an HDMI Cable. App A is a music app (.mp3) and App B is a digital signage app(videos, img). We are currently able to write code for only the App A. We have no sources or an API to communicate with App B. The android box has a remote control. When a user presses a key from the remote (keyboard event app is on App B) then app B starts to play a video. As soon as this video starts then app A must go mute in order to listen to the video. When the video completes in App B, then the music should start in app A again. This needs or should be realized thorough HDMI channels A and B. Anyone any idea how this can be done?

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