Today's best non market android application pick is " OG YouTube"
OG Youtube is the great app which gives you access to YouTube with many additional useful features like downloading the video from the app directly. OgYouTube is the must have android app nowadays if you haven’t tried it yet then give it a try you will defiantly like this awesome app. It plays youtube video's background and some other awesome feature .
Download link : https://www.google.com/amp/s/og-youtube.com/amp