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I agree with the previous answer about stabilization and light, but I'll add my own experience - often the shutter speed is also to blame. When there's not much light, iPhone automatically keeps the shutter open longer, which causes motion blur. I noticed that if you shoot during the day or in a well-lit room, the blur almost disappears. Another tip - try shooting in Portrait Video mode or turn on pro video if you have it, there's more control over the settings. And yeah, hold your phone with both hands or use a tripod - even small hand tremors turn into blur in video.
Most likely it's a stabilization issue or not enough lighting. try turning on the cinema mode in your camera, it usually has better stabilization there. it also helps to increase the lighting - shoot in good light, not in the dark. if the footage is really shaky, hold your phone tighter or use a tripod, otherwise there's nothing that'll help.
The guys are right, but there are a couple more things to consider. The main thing is make sure optical stabilization is actually turned on (camera settings, the video stabilization option). On some models you can accidentally turn it off. If the light is weak, the iPhone really does start to "freeze" the frame longer, and movement gets blurry. Try shooting closer to a window or in natural light - you'll see a significant difference.
One more tip - hold your phone with both hands and brace your elbows against your body, like you're shooting a rifle. A lot of people get blurriness from micro-tremors in their hands. If you're filming while moving (in a car, boat), use "Cinematic" or "Action" mode - the algorithms there handle shake better. And the main thing: don't zoom while you're recording, it just makes the blurriness from any vibration even worse.
If nothing helps, check if your lens is clogged - sometimes just dirt on the lens makes it look blurry. Wipe it with a microfiber cloth and try again in decent lighting.
everyone's right about the light and stabilization, but i'll add something from my own experience. when i was filming videos while fishing, especially on a boat, i kept getting blurry frames when moving. turned out it's also about the frame rate - if you shoot in 4K at 60fps in poor lighting, the iPhone starts cranking up the ISO and the shutter gets slower, that's where the blur comes from. try shooting in Full HD at 60fps or even 30fps if there's really not much light, it helps a ton.
another important thing - the way you hold the camera matters. if you're holding your phone in your hands and walking around, even with stabilization there'll be shake. use a tripod, monopod, or at least brace it against something stationary. like, i take a regular tripod for 500 rubles when i'm filming on the shores of Lake Baikal and the difference is just crazy. also make sure your case isn't blocking the lens, sounds weird but sometimes a dark frame from a fancy case can confuse the autofocus.
if none of that helps, actually check if video stabilization is turned on in the settings - sometimes after an iOS update it turns itself off. and if it's really critical - cinema mode actually works better, though it needs more light than regular video.
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