I can see what you mean, and that the video is somewhat not what it would be like in real. I have lived in northern Norway most of my life, and watched Auroras a lot. It certainly look green and link for the most time. Fainter, it would perhaps sorry gray I guess? Red, when viewed from a more southern viewpoint..

I work at Andøya Space where perhaps most of the space research on Aurora had been done by sending scientific rockets into space for the last 60 yrs.