Hi !
I need help to overlay this image over 
the image that is seen when I open the phone's camera. The idea is to function as a backup camera
Have a look here:
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Repositioning Tools Extension by Mohamed_Tamer, to drag components anywhere on the screen
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ComponentTools Extension by Mohamed_Tamer, to get and set some components features, move the component and reposition it, etc.
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Floating View Extension by jarlissonlira2 to float your component
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Floating Action View: Customized Version Of A FAB Extension by Atom_Developer
there may be something that can help you....
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Want to mount your phone on the back of your car? Most reversing cameras already have guide lines.
I don't need in my car. I want to overlay a gif image .
https://3.bp.blogspot.com/-wrqw-7lVOW8/UbqFvu2K5NI/AAAAAAAAAI0/OurHaobNkfs/s1600/device-2013-06-14-104931.png something like that
You will need to convert your gif to a transparent png, as per the instructions with Taifun's overlay function.
I have a png file !
I don't know but cool video though 
Maybe you could get some reference from this extension:
Thanks to all for help ! I solve my "problem"
Could you share your solution so that others may also learn ?
Well, that is not an App Inventor solution is it ? 
3 Likes