Audio and visual editing software can be used to create monetizable content. Monetization will depend on the scope, limitations, and commercial permissions of the license. If you used samples or loops, make sure that the license specifically allows for their commercial use.
You can monetize royalty-free or Creative Commons content when the license agreement grants you rights to use it commercially. Sometimes rights owners require you to credit the creator of the content or give proof of purchase to use it in your video for commercial purposes.
If you would like to monetize video game content, you will need the commercial use rights granted to you by the license from the video game publisher. Some video game publishers may allow you to use all video game content for commercial use. This info can be confirmed in their licensing agreements.
In other licensing agreements, publishers may not grant commercial rights for videos that simply show game play for extended periods of time. For licensing terms, video game use must be minimal unless the commentary gives:
In order for content to be in the public domain, the copyright of the work has either expired, been forfeited, or is no longer applicable. If you prove that the content in your video is part of the public domain, you can monetize.
Note: This depends on the scope, limitations, and commercial permissions of the license.
The criterion to qualify as public domain may vary depending on many factors.
Commercial uses are less likely to be considered “fair use,” though it’s possible to monetize a video and take advantage of the fair use defense. For more info, check out the article Fair use on YouTube.