You are absolutely correct. You need an employment attorney who will act on your behalf and seek compensation for being the butt of a cruel joke and misuse of surviellance videos against your wishes will likely be viewed against the employer. Make sure to get a copy of that video before it gets destroyed once they discover your intentions. Say nothing to anyone until you hire a lawyer who will pursue the case for you.
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Consult with an employment lawyer ASAP if you want to see what your rights are. I see this was done 4 years ago so you could have statute of limitations problems.
I am a former federal and State prosecutor and now handle criminal defense and personal injury/civil rights cases. Feel free to check out my web site and contact me at (212) 385-8015 or via email at Eric@RothsteinLawNY.com. The above answer is for informational purposes only and not meant as legal advice.