I think every one who have android mobile uses Mx player.i used this player from when I baught my first mobile.really a good app its seeking and zooming option are really get and it also come child lock mode .its also giving background music player which can play video songs in background easily .its support many of codec and supports every type video and audio quality.
And it has a feature which can search substitle from online easily.
It’s truely great player and really loved it