You can increase the size of the HUD in two ways. Either by running the game at a lower resolution, or by increasing individual elements to either 120% or 140% their native size with cntrl-home or by pressing the Right Stick (R3) button. If you run the game using borderless window mode, the only way to change the game resolution is by changing the screen resolution in Windows.

Instead of 1920x1980, perhaps you should try running the game at 1600x900 or 1280x720, the HUD elements will be larger and perhaps any blurred elements will be less noticeable.