Yes, it is possible to have a video lock screen on your iPhone 14, iPhone 14 Pro, or iPhone 14 Plus running on iOS 16. Here are the steps to achieve this:
1. Find a video file that you want to use as a lock screen. Make sure that the video is stored on your iPhone.
2. Open the Photos app and select the video.
3. Tap on the Share button and select the "Use as Wallpaper" option.
4. From there, you can adjust the size and position of the video, and also choose whether to use it as your lock screen, home screen or both.
5. Tap on the "Set" button to save your changes.
Please note that having a video lock screen may impact the battery life of your iPhone. Therefore, it is advisable to use it sparingly and switch back to a simple image lock screen when not needed.