App to create lecture video on mobile by screen recording

I need an Android app. It will be helpful for my educator to create their lecture video. This app is very simple and I need following things in it - -Login/Sign Up - Educator profile -capture images or open images from gallery -now with these images become slides - when lecturer click on screen and sound recorder should start to record lecture -also simple editing option like underline or marker should be there while recording - Final stage app should submit the video to our mailid or database - the video which is created by this app should not be available to user - Voice and Video SYCRONISATION SHOULD BE THE BEST this type of apps are already developed...for your reference you can search on play store with name UNACADEMY EDUCATOR APP