Unfortunately that page he is holding is too far away, and even a completely lossless image would not make the text legible. You need a narrower field of view, like a 6mm lens at least, and probably even higher. Of course fixed focus cameras come pre-focused for distant objects so you probably have to dissolve some glue and re-focus it, or buy a varifocal camera instead. And finally when it is all said and done there are plenty of other ways it could fail, like there isn't enough light for a fast/sharp exposure, or the person holding the paper doesn't pass it under the very narrow view you would have.
Seems like a really hard to obtain goal you have there
That said, the best way to improve the image sharpness is usually to max out the bit rate and in some cases disabling noise reduction will prevent the camera from smoothing over the finer details. If the camera has an Area of Interest feature, you can also take advantage of that to make sure a certain part of the image will be captured in maximum quality.
