Rotation of player based on camera direction and joystick direction in 3D world

Basically, i have a joystick, a camera, and a player. The camera is always facing the same direction and simply follows the player around, and what i want is to make the player rotate left when i drag my joystick left. I'm already moving the player's position based on the camera direction, for example when i drag joystick left, the player starts moving left not in "World's Left", but in "Camera's Left", what is missing is to also rotate the player but taking into account the joystick direction. i have a joystick.Direction which i can use but dont know exactly how (and also Horizontal and Vertical values). Thanks in advance.