When you open VLC to play a video you usually have the controller toolbar at the bottom, that is the bar with all the buttons like Play, Stop, etc. You can actually customize that bar to either add buttons or remove them.
Two I like to add are Snapshot or the camera icon, to take screen shots and the Red Record button, does exactly what it's name implies.
At the top of VLC, click on Tools on the top menu. Then Customize Interface...
In the window that opens, on the Main Toolbar tab, You'll see Line 1: and Line 2:. Line 1 is the Advanced controls toolbar. Line 2 is the main controller bar when your videos are playing in a Windowed format.
Further towards the bottom are the Toolbar Elements box. These are the buttons you can add. In my case I found Snapshot (camera) and Record. All I had to do was drag and drop them, that is click on one, hold down on it, drag it up to where I wanted it in the Line 2 toolbar and let go. You will see a little blue line appear where you can just let it go.
Then I repeated for the other.
Then I wanted to add the same to the Fullscreen controls. Click on the Fullscreen Controller tab and do the same thing. Drag and drop the same two buttons to the toolbar. When finished just click on Close, lower right corner.
To remove a button, just click on it and drag it down off the toolbar.
If you screw it up and cannot get it back to normal, close it out, go back to the top menu, click on Tools and Preferences or press Control + P and at the very left-hand bottom there is a button called Reset Preferences, click on it.
Save it and then restart VLC for it to reset.