Startup Idea: Video and Photo Editing Apps, OTG Disc Burning App

Startup idea to create three applications; a video editing app offering speed alteration for enhanced video effects, a photo editing app providing easy background replacement for photographs and an OTG app to burn CDs/DVDs/BluRays directly from an Android device.

Being a Youtuber with an active channel, I think a good idea would be a video app allowing the user to quickly increase/decrease the speed of parts of a video for matching music, dramatic effect, reduce boring monotonous parts etc.

Another idea photo editing app that will allow take photographs of a person in front of a solid color background, quickly remove that background and replace it with a more exotic location, while allowing the user to position the person as best as possible, hide parts of their body to make it seem more natural etc. Got this idea from visiting a photo studio and having to wait a couple hours for the photographer to do this.

Yet another idea is an app that will allow a phone to be able to burn cd/dvd/bluray discs OTG. There are apps that can read but none I know that will burn. I want to not have to use my desktop anymore and use android mini PCs but all have them have this limitation.