How to make a link for direct download

Hello everyone. There's something that has been driving mi crazy lately.

I made a webpage that includes a video played in HTML 5 and a link to download the same video. But when I try to download it, the video becomes fullscreen, so the only way to download it is by right click and selecting "save links as" which is a litlte annoying (not for me, but some people)

My question is, how can I make a link to download this video in a simple clic??

Greetings!