Inserting an image in the background of a gif animation. How is this possible to implement?

Question

PHP

I welcome everyone! I have a question of this kind:
1) There is a template in which a white transparent area is in place of the face
2) A person uploads his photo with a face, moves, scales and adjusts to the cutout in the template (gif animation)
The template is a gif-animation, at the entrance we have several parameters (uploaded photo, coordinates) well, you need to somehow assemble all this into an animation.

Answer 1

regular libraries, as far as I remember, do not know how to work with animation, so just save them frame by frame, make changes and glue them into one

Answer 2

you can try to throw it all into the canvas and then save it as a gif, but this is js, not php, as you indicated,
but it also had an idea like the commentator above, i.e. split by frames)

Answer 3

Split the gif into frames, put a backdrop on each frame, then fold the frames into one gif in the opposite direction

Answer 4

first request to google
html transparrent background gif animated
https://www.sitepoint.com/community/t/how-would-i-...