Sharpen a video to bring back detail in soft or slightly out-of-focus footage — it’s useful when you need to crisp things up without refilming.
Steps to sharpen video
Apply Effect → Blur & Sharpen → Unsharp Mask.

Adjust Amount and Radius until the image looks crisp and the details pop.

Keep Threshold higher to avoid enhancing noise in flat areas where you don’t want it.
One more thing
Don’t overdo it — sharpening too much creates halos around edges and makes everything look unnatural. Less is usually more.
Related how-tos
How to blur video in After Effects
How to apply an effect in After Effects
How to use the effects & presets panel in After Effects
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