Sorry to trouble you all, but i want to create some stuff, but i dont know how...

Im a total noob, so sorry about that...

anyway,

What i want to make, is the following: I have a certain amount of video's, and i want to create it so that when a certain button on the keyboard is pressed, on of the video's is shown on the canvas. 

When no button is shown, i want that the canvas is also showing an certain video. 

So how can I make the connection between key on my keyboard, and the video's?