Ooooh, Think I misunderstood at first. If i got this right you actually want the balloon to look like its tracked in the scene or "attached" to the sky? I ask this because that balloon is not moving in that example you posted. If there no movement in the original camera shot you can add a camera and a null, put the shake on the null and parent the camera to the null. If theres moment in the camera you should track the shot, it will look better.
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