this player in this video  https://www.youtube.com/watch?v=g5tgqemHxmE   recommends using reshade for bf4 but you don't get banned for this??   not considered a modification ??

game play  https://www.youtube.com/watch?v=js7VwajXLZI&t=33s 

Using ReShade won't get you banned as long as you're not removing anything with it, u can use it confidently without any concerns