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You could use that app (I have it myself) and film a green or blue background (piece of paper perhaps from not-McPapers) and then use the color key effect from your editing app to overlay that VHS effect onto you recorded footage. That is what I will try once I am free to do so.
 
For four bucks you can't go wrong with the app. You might also look at some of the effects in FCPX. Under Effects there are several groups under "Stylize," including Add Noise, Aged Film, Bad TV, Camcorder, Projector and Super 8mm. Also, under Looks there are 50s TV and Faded Sun as well as some others.

Just a thought. Good luck with your project.
 
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