Hello everyone, I have a video that is native resolution is 500 x 500 and I want to set it in a 300 x 300 to fit my website.

I would like to give users the options to click full screen or some other button to be able to float the video in a 500 x 500 pop up window at its native resolution.

How can I do this? Somebody said that I can do it with Javascript, but how? Any body can help me? Or any program I use to do it?
Thanks in advance.