Set up webcam and caught my roommate stealing. Is this illegal in Florida?

I suspected my roommate who lives in another bedroom of stealing. Though I asked her several times not to use my things and she denied it, I still had my suspicions. I left my webcam on when I left for a couple of hours today to see if my suspicions were justified or if I was just crazy... but an hour into the video she walked in and started going through/using/taking my things. Is this legal? I do not want to get in trouble at the apartment complex I live at for doing this... please, answer me with facts and not opinions. This is very important to me, as some of my deceased fathers belongings that I had are now missing, and I want to confront her so I can try to get them back, but I can't if she can use the video against me.