What gameplay from which developer can you monetized?
Video game content may be monetized depending on the commercial use rights granted to you by licenses of video game publishers. Some video game publishers allow you to use all video game content for commercial use and state that in their license agreements. Likewise, videos showing software user interface may be monetized only if you have a contract with the publisher or you have paid a licensing fee.
To learn more about obtaining commercial use rights to third party content, please review how to read licenses to understand your rights and what YouTube looks for in your documentation.
What can't I monetize?
Without the appropriate license from the publisher, use of video game or software user interface must be minimal. Video game content may be monetized if the associated step-by-step commentary is strictly tied to the live action being shown and provides instructional or educational value.
Videos simply showing a user playing a video game or the use of software for extended periods of time may not be accepted for monetization.
You can find more information on copyright law and fair use here:
United States
http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter9/
http://www.copyrightwebsite.com/Info/Law/FairUse.aspx
http://chillingeffects.org/fairuse/
The European Commission website has some helpful information and links.
World Intellectual Property Organization
You can find the Intellectual Property and Copyright Office applicable for your country here:http://www.wipo.int/directory/en/urls.jsp
For example my gameplay video of PvZ Garden Warfare from Electronic Arts is monetized since according to EA they do not give out blanket permission, but they have worked with YouTube directly and generally don't mind fair use of their material even on commercialized YouTube channels.
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