With Nikon Z30, you can record your videos at a highest resolution of 3840 x 2160 at 30p,25p,24p fps and save in MPEG-4 and H.264 formats. Nikon Z30's 4K is the common standard resolution in consumer video world.
A great advantage of Nikon Z30 while shooting video at resolution of 4K is that there is no crop factor so you can use your lens at its actual focal length.
No Video Recording Limit
Nikon Z30 doesn't have the 30 minutes max video recording limitation that many cameras have, so you can keep recording non-stop until either your storage is full or battery is depleted or the camera over-heats.
Z30 features a high speed mode where it captures videos at 120fps which helps to create slow motion videos. If you shoot a video at a frame rate of 120fps and play it back at 24fps, the video will be 5x slower and longer than normal.
Microphones, Speaker and Headphone Connections
Nikon Z30 has a built-in Stereo microphone and a Mono speaker. Nikon Z30 also has a port for an external microphone
so you can record high quality sound with the help of an external microphone. Unfortunately, it doesn't have a headphone port though.
If you are getting into videography and want to know what are the must-have video accessories for your camera, read our article:
Essential Videography / Filmmaking Accessories for your Camera
Electronic Video Stabilization
Nikon Z30 also features an Digital Video Stabilization mode where videos are stabilized in-camera while you are shooting. Keep in mind that this effect may crop your videos a little bit and doesn't help stabilizing still images. This kind of video stabilization effect can be replicated by using some of the advanced video editing softwares in your PC.