There are four stages of video production and this is a constant for every video that gets made regardless of category.
Write script, prepare budget, audition actors, assemble crew & talent, place equipment orders, scout locations, prepare contracts, storyboards, shot list, schedule, etc.
Film the video.
Transcode media, edit video, create sound design, edit and mix audio, compose a score, record ADR or VO, create motion graphics / visual effects, color grade the footage, prepare final deliverables in appropriate formats / codecs.
Promote the video. [Usually handled by client or outsourced to PR/communications company. However, video company is often consulted during pre-production about distribution as that may inform script and production choices.]