Fix flickering blurry Sprites on camera movement?

Hey guys
I have been working for a week on this problem, every time i move my character and the camera follow my character the birds which are in the road and my character collect them gets blurry and flickers..
to be more clear the birds on camera movement stay in their place but they are shaking and gets blurry and when my character stop they gets sharp..
my camera is perspective and i need it to perspective cause my game is 2D and the road is 3D i tried these stuff to fix this but nothing changed:
disabling the script that make my camera follow my character and put the camera as a child in the character i tried many script i seen for making smooth movement and for moving in pixels not in fractions of pixels
i tried change the camera to orthografic and i need perspective i changed the perspective camera settings in the inspector like making the clipping near plan to 30 instead of 0.01
i tried changing the sprites import settings from the max size and format passing by wrap and filter mode and ending with pixels per unit and even making the sprites as quads and textures!
mip maps make the problem worse
making Material and set it to sprites default with pixel snap on
make the birds bigger or smaller disabling their animations
changing the frame rate didn't work changing the quality didn't work
making the default behavior mode in editor setting in project settings to 2D or 3D
disabling and enabling anti aliasing and Vsync Count.
am really tired and need it to be fixed
its not my monitor cause the problem is appearing on editor and its much worse on iphone 6 plus!
and i barely can see the problem on Sony Z1
there is plugin called pixel perfect does it solve my problem ??
when i enlarge the sprites in the scene it doesn't blur but i need them to be small they cant be large
if you please could help me and tell me how can i fix this problem, i would really appreciate it i'm stuck with it and i think it's not like other problems i faced it kinda need a pro to solve it :(