The GET IMAGE command in DBP will grab an image of what is currently on-screen in the DBP program in a specified area. That sounds ideal, right? Just constantly use the get image command? That would work if you were only interested in grabbing video of your own DBP project, and even then, the recording code would have to be part of the game, not run as a seperate exe. The problem is DBP is only concerned with it's output on it's window, so if you set focus to another window, DBP will continue grabbing images from itself, not the newly opened program. Aside from the fact that the get image command is extremely slow, there really is no way to do what you want right now. At all.
Visual Basic and other languages can do it, because you have more control, but with that control comes a bigger learning curve.