Green Screening 

• ​iMovie makes it easy to create green-screen videos. This option is now available on ipads as well as Mac computers. You can also use Keynote for static green-screening.
• Green Screen by Do Ink is an ipad app that allows you to easily create green screen video. Cost: $4:50 Overview 
• Using Green Screen by Do Ink in a makerspace


• VLN thread with suggestions and examples
• This video shows  a green screen made with fabric, PVC pipes and stretchy cords. It shows the placement of lights to avoid shadows.
• TCEA Tips for Green Screening
• Why & How to Green Screen in Class
• Using a Virtual Green Screen video -projected onto whiteboard or screen​

Some examples 

• Shoes
• ​Netsafe Scammers
• ​School News
• ​van Gogh style

Static Images

It is quite simple to remove a plain background, using Keynote or Powerpoint, from a static image then layer that image over another image. 
Using Instant Alpha in Keynote on iPad​ 
​Using Remove Background in Powerpoint
​You can also remove more complex multi-coloured backgrounds.
​Remove.bg - easily remove any background from images containing people.
Pixlr- removes any background but more fiddly.