How can I record a video with the screen locked?

[Windows Central Question]

Recording video with locked screen

I need an app fo recording my onboards. There are some similar apps for android platform (dashcams, etc.), but none for wp8. I wanted to develop my own app fo this purpose. But I have some questions that need to be answered.

Is there any way to record the video with the screen locked?

I can prevent phone from going into locked mode, automatically, but it is not enough for me.
Is there a way of catching the power button event?
Is there any difference (from the point of application and OS) when the app is in foreground (i.e. another app is on the screen), and when we just lock the screen using the power button?

 

[rhapdog]

There are several apps that will do dash cam recording for Windows Phone. I can't speak to whether any of them would be actually suitable to your particular needs, however.

If you are wanting to develop for Windows Phone, I would recommend joining the site and heading over to the Developers Corner - Windows Central Forums to ask your questions there, as they would be better able to assist.