How to 'fly-in' an overlay image
Hi everybody
I'm quite new here and wanted to create two white-ish overlay pictures to fly in from either side and afterwards make them fly out again.

I don't know how to do it and it seems that I'm not using the right words when searching for it on google etc.
Could you kindly tell me how to do it, or tell me where I can find the necessary information?
Thanks,
Michel
