Lock screen while playing video

Hello,

I know there is no support at the moment, but would like to know if there will be a software upgrade to support this in future releases? I would like the apples products have the ability to lock the screen while still allowing videos to play either from youtube or stored videos. This will allow me to hand the iPad or iPhone to my kids and let them watch their shows without accidentally pressing buttons and getting out of the video then getting upset, because their video is gone.

Thanks,

Andrew