The modder notes a few additional issues with the mod such as clipping and “wonky” field of view.
Load screens or cutscenes can cause the effect to break but going through the steps again will reset the camera to first-person. There is a video tutorial available for if the camera freeze doesn't work for users. It freezes the camera zoom value and when the player equips a bow or binoculars and zooms in, the camera will stay zoomed offering a first-person perspective.
The mod that allows users to play From Software's role-playing game from a first-person perspective all the way through.