My wife faces away from me when we fuck...on our sides, spoon position. We set the iPad up to porn vids of guys cumming on their partners...she likes to watch cum...or since she doesn't face me, maybe she just prefers looking at any guy hot and not me...but I digress. I wish we could flip the iPad to video camera and just watch me going in and out while I'm taking her from behind...without recording of course but she thinks I'm recording no matter what...so...fantasy squashed...again. Sigh!!! So, to reply...I think she needs a visual stimulant...
Maybe she's actually not as stimulated by visual stimuli as you're assuming?
I'm not saying that women can't be as stimulated by visuals as any man. (Humble brag incoming). Believe me, I've had some partners who have loved watching me get an erection.
And, more to the point, several of the ladies here have demonstrated this.
But actually, everyone is different, and you shouldn't try to move her towards doing anything she doesn't want to do until you're sure she's on board.
I'm not saying that you intended to imply that you would do this... and not to get all social justice on you, but... there ought to be a special circle of hell reserved for people who film a partner (or anybody else) during a sexual act without consent.