Jing will be retired soon, and you can learn more about this here
Missing plug-in error for video preview.
Jing uses Flash Player to display video in the Preview window. If the Flash Player is not installed, Jing returns an error and does not display video.
Current Macs ship from Apple without the Flash Player installed and Flash Player can be manually removed from the system if it was previously present.
To enable Jing video preview, please download and install the Flash Player software and then restart Jing.
Flash blocker software such as Flash Frozen or ClickToFlash should not affect Jing previews.