The app which I use and prefer to see videos is the one and only MX PLAYER.
From the the starting I use only this MX PLAYER app.
I love this app for many reasons-
This app plays online videos, which is the best thing.
Also here in this app we can easily zoom the video.
And also increase the maximum sound of the videos, this type of feautres did not provide any other video player.
The design of the app is also very good, we can easily change the layouts of the app.