First off, adorable! Your bettas are too cute!
Your video camera is awesome, I love those ones you can actually put in the water. They are amazing.
I don't think its that bad that he can see her. Unless he is constantly flaring at her, I see no reason to keep them from seeing eachother. I have two males in a divided tank where they can see eachother, and there was initial flaring, but now they both do there own thing.
there's always different reactions to bettas seeing each other. my partly blind HMPK, Theo, is right next to my delta, Ichi, and they never have any problems. Ichi only recently started tail biting, but that's my fault(i was a touch slack on his water changes. >3>;). Cup, on the other hand, can't see ANY other betta. he'll literally ram the side of his tank to try to get to another betta. i guess, just watch your fish for signs of stress. does he flare at the other betta alot, or ignore it?
Nah I dont think it's bad. I have mine in a divided tank and they can see each other. They always have but they got bored over time and was like "meh" so every now and then they'll flare. Poor little Squeaky in his tiny tank that's sitting in front of my big 10 gallon is ALWAYS flaring at my older bettas. haha He's constantly worried about them.
As for your question, i would say that there is nothing that is going to harm Bo nor Princess because they are seeing one another regularly.
Bo might just be trying to impress her and build nests and such. So i would just suggest that the only problem is that they are in the kitchen, which isn't much of a problem at all.
You would just have to remember that they are in the kitchen and be careful while you cook that nothing can fall in the tank, like grease or another substance. So to me, that should be your only concern.