Hi Alex,
As others have responded, there's a certain element of subjectivity in the use of, cinematic, to describe a video or photography. Personally, I associate it with imagery that's grand, powerful, dynamic. While certainly not the only or even best example, I would describe a film like "Lawrence of Arabia" as cinematic. David Lean (director) and Freddie Young (cinematographer) did magnificent work in the positioning of the lens and shot composition to convey the grandeur of the desert.
The use of drone video is a cinematic technique. Drone footage can make almost any location look dramatic and grand. Use of a moving camera on a dolly, crane, Steadicam, or gimbal, or post production editing techniques to simulate that look are cinematic. For example, if you shoot a video in 4K but produce and publish the final edited version in 1080, you can build keyframe sequences in post that simulate the look of zooming, panning and tilting of the camera.
Lighting can be cinematic. Rather than lighting a person or scene in a manner that's flat or where everything in the frame is evenly lit, lighting that adds drama to a scene makes the shot more cinematic. When you think, drama, envision shadows. There's an old saying in photography, "light illuminates and shadows define." Adding shadows gives a scene more drama or, at the very least, more personality. The same can be said for people in a scene. Adding drama through lighting is cinematic.
These are the things that come to mind for me. I look forward to others sharing the aspects or elements of a video or photo shoot that add a cinematic quality to the images.