hey guys i know all of you have seen music videos that the transition is a blended color that swin from right to left or upside down or ...
like this one here
i make these kind of transition manualy inside after effect , but i'm sure there was a plug in for it that i can not remember
Your example is not a plug-in but film damage stock footage clip overlaid using a blend mode. The organic nature of a real film damage like light leaks are very hard to duplicate. I'd suggest searching stock footage sites.
Twitch plug-in from Video Copilot may be what you are looking for. Enable the color and slider operators and tweak it from there: