It looks like you're searching for a guide to finding or watching in Hindi 720p MP4 format.
Within the MX Player app, you can usually select video quality settings (such as High/720p) and choose your preferred audio language if multiple are available. Why Avoid Unofficial "720p MP4" Downloads? Plan B S01E04 Hindi 720pmp4
Unofficial uploads often have "hardcoded" subtitles or downgraded audio/video quality. It looks like you're searching for a guide