No Preview Camera In Oovoo How Do I Upload Home Videos From My Camera To My Mac?

How do I upload home videos from my camera to my Mac? - no preview camera in oovoo

I have videos from my camera and I dance with my mother or something, and I have on my mac. My brother los iMovie, Preview, and do nothing? So I must have iMovie to do this or not, without doing it, and how? Even if I have iMovie so I can download it easily? DO NOT BUY Prosess!

Thank you!