iPhone-HowToTurnoffScreen&Keepavideoplaying?

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This is not possible if your device is not jailbroken. Apple doesn't allow app developers to publish such apps due to their strict rules. You can have a look at the Apple's Human Interface Guidelines here

如果您的设备没有越狱，则无法进行此操作。由于严格的规定，Apple不允许应用开发者发布此类应用。您可以在此处查看Apple的人机界面指南

If your device is jailbroken, then there might be some tweaks in cydia for this.

如果你的设备被越狱，那么cydia可能会有一些调整。

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You can find the answer in Apple's developer documentation by searching for "Implementing Long-Running Background Tasks".

您可以通过搜索“实施长时间运行的后台任务”在Apple的开发人员文档中找到答案。