in YouTube or mxplayer there is feature that if you tap and hold the screen, playback will be at 2x speed and if U remove the hold, it will play normal speed.
Add this option (along with settings to change tap-hold speed to 1.5x 2x 2.5x etc as seen in mx player). Also overall in app add feature for more refined precise user defined input speed settings like 1.25x 1.15x 1.1x etc