What sets an experienced operator apart from a beginner is not written documentation. It is tacit know-how, the kind you cannot put down on paper.

On a line, what sets an experienced operator apart from a beginner is often a set of techniques and habits that, added together, make for productivity and safety. When the expert leaves, those techniques are lost and productivity drops. Quality can suffer too.
A path per line or per machine: the nominal setup, the drifts you actually run into, and the assessment that checks the operator knows what to look at before starting a run.
The workstation sheet written from the recording, checkpoints in order, every step linking back to the second of video that shows it done right.
A changeover that takes two hours with one operator and half a day with another, with nothing in the procedure to explain the gap
Scrap concentrated on the first parts after every shift rotation
Fault diagnosis that always comes back to the same two people, nights and weekends included
A retirement can be seen coming. The six months before it are the right moment to capture what only that person knows how to do.
The same task, done three different ways across three sites. One reference recording becomes the version everybody follows.
A written procedure proves it exists. A procedure that is filmed, dated and tracked to completion proves it is being followed.
No. Recording happens at the workstation, during a real operation: a changeover, a setting, a restart. It is better that way — a technique re-enacted for the camera loses the hesitations and corrections, which are often the most instructive part.
A routing sheet says what to do and in what order. It says nothing about the pressure in the hand, the sound that means it is catching, or the visual cue that makes you stop. The recording keeps all three, and the procedure it produces links to the second of video that shows them.
Transcription works from the audio track: a microphone close to the operator — lapel or headset — makes all the difference in a noisy environment. The module and the procedure stay readable afterwards, since they are written and not only spoken.