I watched a video on YouTube and am kind of intrigued, how do you get these effects, do you need a special program?
Heres the link to the video by the way
Photo Booth in your Application folder.
Yea, I figured that much, but when I tried it, every time I changed the effect it stopped recording.
Am I able to put the effects on a video that was already created?
It looks like he's applying the effects to a webcam broadcast. I'm not sure exactly how he's doing it, but the effects look like they're the common built-in Photo Booth effects.
He could be using a screen capture tool to capture the photo booth window.
Screen capture doesn't produce video... only still images.
I dont think he meant the OSX screen capture, he meant a program like iShowU which records the screen in real-time video.
Photo booth records it and then he combines them with iMovie
hope this gives you an idea..