I don't know about _moving_ images per se, but still images have been possible for a while in org mode. simply drop a link to the image file (possibly with an O

I don't know about _moving_ images per se, but still images have been possible for a while in org mode. simply drop a link to the image file (possibly with an ORG_OPTION specifying image size) and you'll have an image displayed in the buffer of you plain text file. (there are even packages for making a screenshot and dropping the file in the current folder and making the aforementioned link, which I use a lot during online lecture note taking)