How can I check if a player can be seen in the camera?

I am trying to check if a player can be seen in the LocalPlayers camera, but i'm not sure how to go about it. I'm assuming I need to use the CoordinateFrame of the CurrentCamera but i'm not sure how to check if they are in view of it, as it could be very far away or right up close to them. Any ideas/suggestions would be very much appreciated.