Music copyright

Hiya, after some advice please!
Our organist and church quartet mentioned that if a video is taken of our wedding in church we’ll need to pay 50% of the total cost as Copyright Assignment. At first we weren’t bothered as not having a videographer anyway but then they mentioned that personal phone videos shouldn’t be taken either (like me walking down the isle to a classic ‘here comes the bride’). I suppose we can ask people not to video at the start of service but someone is likely to still do it! And furthermore what to do about zoom livestream for those that can’t attend as the world is still largely immobile. Has anyone come across that? What do you do in this situation not to incur the fee? Thanks!