Apple ; How about moving location of the camera lens to the edge of phone , or a quick clamp lens extension .this would hide .
camera lens on side edge ,that way u can hold flat in front of u at belt level without letting others know u r filming by holding up and flat out all can notice would also put yourself at ease to film more witout making others feel uncomfortable of being filmed .
Let me know what you think.
For I have some other good ideas Ithink you will like.!!!