Can we control background video playback on Leanback Launcher by remote controller?

I’m testing Google’s sample app After start playing video and go back to Leanback Launcher home display, it keeps playing in background with now playing card. 
I found pause key stops background video and changes back to normal background, and only after that MediaSession callback is working.
After background changes to normal Leanback Launcher background paper, play/pause button changes the video status of now playing card, However background is not video but normal display… Is there a way to show video in background with this condition?

See below video for the behavior I’m writing about.
When background video playback changes to normal background, I’m pressing pause button on Leanback Launcher display. After that, I’m pressing play button of remote controller to play/pause, which only working in now playing card, but background is not video.

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