Yes, it is possible to play an NCS (NoCopyrightSounds) song on a livestream. It depends if this is a livestream of yourself as an independent creator. In that case NCS releases can be used as background music in line with their usage policy. You have to consider if this livestream has the sole purpose of playing music and/or if you have used the NCS name in the title or logo on the video your stream. The latter is a breach of the trademark and you will be asked to re-title or remove your stream. The trademarks are: NCS, NoCopyrightSounds & No Copyright Sounds.
Here at AudiobyRay we have both Mixing & Mastering experience for over 9 years.We mastered over a 1000 EDM tracks, Stem Mastering sessions, and countless DJ Mixtapes so far