I have the simplest "rig" that is a MUM attached to an EOS M with a DIY adapter. That adapter is a glass lens filter that fits the 18-55 kit lens, and I took one demist shield and popped the plastic lens part of it away and then glued the remaining ring to the glass filter. So the MUM eyepiece threads into the filter that threads onto the camera lens. Works just fine, but wouldn't count on the glue holding so I handle it with some care. For PVS-14 there's ready made adapters that work exactly the same.
Long exposures tend to get better, though unrealistic (close to zero noise, exposing dark images that the eye could not see anymore), pics, but that either means you need a small aperture or some kind of an ND filter. With small apertures every little speck of dust / grease stain on the eyepiece becomes a bit too visible.
Overly sized apertures is of no use as the sweet spot of a PVS-14 eyepiece is rather small anyway (rather obviously designed for a ~5mm aperture that'd be your Mark I Eyeball). Also due to the limits of the eyepiece the adapter between your lens & the eyepiece must be quite short.
The output dynamic range is massive and a good camera really helps to get both the blacks & highlights. Shoot RAW or if that's not possible for video then use a profile that gains you more DR on the video. With Canon cameras you can use Magic Lantern to get RAW video if you wish.