I just need to change player's PAN with the help of all mouse forces (X and Y as well)...
So, if player moves mouse upwards, player turns upwards...
If player moves mouse to the right, then player will turn to the right too...
Same as above, if player moves mouse to the left, then player will turn to the left too...
If player will move mouse down, then player must turn down... And so on.
That way it will be really easy and comfortable to AIM, cause player moves in Global coordinates and cameras PAN is fixed.
Aiming will be similar with AIMing that made in game Alien Shooter.