You can play videos in a QSlide window allowing you to use other apps while the video is playing.
Open the Gallery app and begin playing the video.
Tap the QSlide icon  at the top of the
screen to activate the QSlide feature to play the video in a QSlide
window.
 at the top of the
screen to activate the QSlide feature to play the video in a QSlide
window.
To close the QSlide window, tap the Close icon  in the upper-right
corner of its title bar.
 in the upper-right
corner of its title bar.