easiest software to overlay an image on a gaming video

Jojo981

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Jan 18, 2015
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I am recording some videos of games I play using Nvidia's ShadowPlay. I would like to overlay an image on a portion of the screen I want to hide (the chat window). What is the easiest software to do this with? I would prefer something free but if it is worth the money I would pay.
 


It must be possible after the recording has been made. Compared to most video editing it seems like it would be a fairly simple thing.
 


Oh yeah sorry I thought you meant while it was being recorded.