Enhancement can improve clarity, but it cannot create a recognisable face from a few pixels of low-resolution footage.
No. AI upscaling predicts plausible detail rather than recovering real detail, so results should not be used to identify people.
Photogrammetry can estimate height by comparison with known objects, usually as a range affected by camera position and posture.
No. Camera clocks may be wrong and recordings can have gaps, so timing should be checked against known events.
Store them away from heat, moisture and magnets, limit playback and have them professionally digitised at full quality.