MX Player for Android is possibly the best, simply most perfect free video player I found on Android so far. The videos that I was not be able to play on many other players properly, MX Player handles like a pro. List of MX Player's qualities are long and some of them are as following:

Gesture Control Navigation: The best part of MX Player is its approach to most frequently used functions through on-screen gesture controls. For example:
Change volume – swipe finger from top to bottom at right half of the screen to decrease or bottom to top to increase the volume
Change Screen’s Brightness – swipe finger top to bottom at left half of the screen
Move Forward and Back by swiping finger left to right