Most of you would have faced this problem of viewing the videos when they are vertically shot. Now you have no clue on how to view or rotate that video and I atleast end up rotating my laptop to view it.
But here i bring to you how can i rotate a video using VLC player. Now for instance if your video is as below

You can easily rotate this video using VLC player as shown below. Click on Tools and select Effects and Filters. Alternatively you can also press Ctrl + E.

A box pops up and under the Video Effects section and Basic tab as you see Transform checkbox unchecked.
Click on the check box and the options below will get activated. Now select how you want to rotate your video and click close
As soon as you press Close, the video will be rotated. Now you can enjoy your video.