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Is there anyone here manage to work video background working auto play in mobile device? Please help me again.

Sorry auto play is disabled by the browser in mobile devices. It is implemented to save mobile data and the life of the battery.

Most browsers will disable auto play if the video has audio. So, removing the audio from the video may work.
But some mobile browser may completely block auto play to save data and battery.

I already remove the audio in my video and still not playing. Is there another way to play the video background on mobile devices?

If the browser blocks this functionality then I do not think there another way.
And even if you find a workaround then it may stop working in future updates of the browser because it is intentionally blocked.