lol, no, I really don't think it is. Exercise Hanlon's Razor; it's pretty reasonable to see how an awkwardly gesticulated hand wave to an audience could come off as a Nazi salute by mistake.
And anyway, why would she do that on purpose? Neo-Nazi dogwhistle? That's the last demographic the Trump camp needs to win over, he's had them locked down for a long time already. It doesn't make any strategic sense. And yeah, I know, Trump's campaign thus far hasn't exactly been marked by cohesive, cogent strategy, but he and his surrogates have been using much easier and more direct methods to let bigots know that he's their man.
In my humble opinion, you're just seeing meaning where there really isn't any.
I want to say he has something attached to the camera something like this GoPro Karma Grip for GoPro HERO6 Black/HERO5 Black (GoPro Official Accessory) https://www.amazon.com/dp/B074PQRB4K/ref=cm_sw_r_cp_apa_i_biW1BbQ00NW0S but for the headband