Mouse Look and Mouse Zoom function built into WOFF BH&H II - the FAQ has info on this in section 53, and can be found here:https://www.overflandersfields.com/index_html_files/FAQ_WOFF_BH&HII.pdf
WOFF UE v 4.14 or later, and WOFF PE also have this. AnKor's 3D DirectX shaders provide the feature (thanks to AnKor!).
See WOFF UE FAQ section 53:http://www.overflandersfields.com/index_html_files/FAQ%20WOFF%20UE.pdf
Of course, we thoroughly recommend head tracking (such as TrackIR ) instead of mouse look, for full immersion and easy of play.