The HVX200 is a fixed lens. If you need to change lenses, you need to get a 'depth of field adaptor' from the likes of P+S Technik, Cinevate, Redrock, Letus, et al. Basically, these are devices that attach to the front of the HVX200 lens and allow you to put on more traditional 35mm still or cinema lenses.
i have two century optics lenses for sale for that camera. they are perfect condition and do not require a dof adapter. the adapters are a sloppy business overall, the letus ultimate is the only system that allows proper back focus adjustment and it starts at $4600 without any lenses. they also require power, and maintenance for achromats, ground glass, dust, etc.
my lenses are 82mm thread, lightly used, fit directly onto your camera.