Thinking about it know. It's only Microsoft doing it so far. We should really worry when all gaming companies begin to fellow. But if you go down to ''Account settings'' and then to Monetization which is at ''Channel settings'' read ''Which videos are NOT eligible'' under Guidelines and Information.
Your video is not eligible if it contains content that you didn't create or get permission from its creator to use. You need to be able to show written permission for the following video elements:
Audio: recorded music, live performances, cover songs, background music, etc.
Visuals: images, logos, software, video game footage, etc.
Any other content you don't own worldwide commercial usage rights to.
Examples of videos that are NOT eligible
Your video contains a song you purchased for personal use (e.g., bought on iTunes or in a store) but didn't obtain a commercial license.
You found a video on the Internet and you cannot prove that it's in public domain.
You are only singing words of your favorite copyrighted song
You have used content from someone else without permission, but you haven't yet received a copyright notice on your video.
You edit together or "mash-up" other works
You only use 30 seconds of a song or video clip
Your video does not provide proper attribution or credits as required by a license.
If your video is not eligible, it may be removed from YouTube.
So if your not allow to record in-game video then why is YouTube full of it?
