I highly doubt she would lose her license. The organization she was working for may fire her as she has exposed unethical, if not criminal, conduct. I am aware that there can be criminal penalties, but patient ID info seemed to have been adequately blurred out.
I recall one nurse (RN) one time who would post pictures of patients, who were incapacitated enough to not know what was going on, on Facebook. He lost his job, but ended up working in another hospital over the hill. CNAs doing similar things would likely lose their certificates as they are not as in short supply. CNAs doing the same thing, in a different situation and hospital, were publicly exposed in the media and penalized, but the RN was very quietly dealt with.
Looking at the situations this nurse was in and her "nurse speak", I have no doubt as to the fact that it is a truthful video from her viewpoint. Not exactly sure what you mean by legitimate. Her language was very "critical care nurse" in the manner of speaking. Many of the scenes were shot at the bedside of patients and other workers walking thru engaged in conversation as if they were coworkers. The "facts" of the video I cannot really say.
Of interest, this same hospital, Elmhurst, in NYC was featured in another video. News reports were giving harrowing details of long lines to get into the ER, but a video posted on line showed no lines and few in the ER. Not saying there were not very sick ones in the ICUs.