Being filmed during sex?

So my bf & I are doing long distance, & he might be coming to visit in a month or so. Its been 3 months since I've seen him.

I had a thought that maybe him & I could film us having sex. It would stay between him & I, but I thought maybe it'd be good for when we're apart? Idk

What're your thoughts on it? Any tips on the best way to film it?

Any tips on how to bring up the idea to him?