1. It is not fair to install a CCTV in a private area more so as it is a changing area for both genders.
2. Why was the footage being viewed of a changing area when by default you stumbled upon your man and woman in the same room 'talking to each other in privacy'. Do you have proof of anything else?
3. What is immoral and who defines it
4. What indecency have they committed
5. Were you not encroaching on their privacy or doing some sort of witch-hunting exercise during / after your work hours?
6. Have you the ground to terminate them
7. Even if you do terminate them do you have the chance to face the tribunal
8. What kind of company do you guys work in, where such Talibanisque dictats are imposed and everyone is under the "FBI" scanner
9. Two adults with or without your knowledge, guidance, counselling, mentoring, approval, appointment, permission, are free to talk, kiss, love each other. Who are you to decide how they should live their lives?
10. I hope you are not in HR
11. The way I see it, it can be best described for you and those with you, as VOYEURISM otherwise why would you do what you did and who authorized it
12. If they are unmarried, throw a party and enjoy life... you get invited to their wedding
13. If they are married individually, keep a contraceptive vending machine in your office as you have already installed a CCTV for post-dressing viewership in an area that is very private
14. Get a new job. You can think better.