If you're running iOS since iOS 9 on iPhone 6 to the new iPhone 8 Plus, you can change the camera resolution after recording the video.Lower quality settings can be a way for you to save storage space.
Also, if you want to maximize the video, the only way to shoot 4K video is to change it in the settings menu, not the camera app.You can do this for both slo-mo and standard video.The implementation is very fast and easy.
On iOS 11, go to Settings> Camera , click Record Video or Record Slow-moand choose your preferred resolution from the options listed.
On iOS 10.3 and lower versions, select Settings> Photos & Camera> Record Video or Record Slow-mo and choose the resolution you want.
Note that the higher the resolution and frame rate, the more storage capacity on the iPhone. For example:
Standard video recording
Shoot Slo-mo video
I wish you all success!
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