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Turn on "Cinematic" mode in your camera - it often gives better sharpness than the regular mode, and try shooting at a higher frame rate if the lighting allows. Also make sure the lens is clean and you're not shaking your phone while recording, even with stabilization - I noticed this problem when I started filming for my recipe blog.

Lens cleanliness is the first thing you should check, because even microscopic fingerprints can cause that exact kind of haziness. Second - make sure you're not accidentally covering the camera with your finger while shooting, that happens a lot with side-facing shots for Shorts.

If the lens is fine, try shooting not in the YouTube app, but directly in the iPhone's standard camera app with a higher video resolution format, and then upload the finished video. The YouTube app often compresses the quality already during recording, whereas the native camera preserves more detail. One more tip - shoot from at least half a meter to a meter away, the iPhone focuses unstably when you're too close to your face and you get blur.

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