This highest resolution at which this camera supports 30 fps is 1920x1080 (which I think will be fine). The maximum resolution is 2592x1944 at 15 fps.
Below is the output of "v4l2-ctl --all --device /dev/video0" the area highlighted in white is where it would show if the camera supports any focus control options (but there are none listed). It's a bit of a bummer since this driver seems to be the same used for most of the modular type USB webcams I have found, even the 4k models. Hopefully a fixed focus camera will work better.
I will update this post again, with hopefully a better test setup, when I get the fixed focus camera (which is also an OV6540).