If the subject of your video is green or is wearing green, you should record in front of a blue background. Likewise, if the subject of your video contains blue or is wearing blue, you should record in front of a green background.
The audio from the original clip and the audio from the green-screen or blue-screen clip play simultaneously. You can reduce the volume of either clip so that sound from the other clip stands out. For more information, see Add audio effects in iMovie on Mac.
All my green screens are free to use as green screens for any project, you can monetize videos with it in it no problem on my end as long as you use it as a green or make something with it, don't just edit out my intro then reupload it with a green screen in the background. You have to put some effort in and make it your own. And if you use you must provide a link to the original green screen in description.
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