Sexual Abuse Support Group
Sexual abuse is a relative cultural term used to describe sexual relations and behavior between two or more parties which are considered criminally and/or morally offensive. Different types of sexual abuse involve: Non-consensual, forced physical sexual behavior such as rape, incest or sexual assault, or psychological forms of abuse, such as verbal sexual behavior or...

You are not alone. Although everyone has a different story we are all in this together. It was NOT your fault. I fail to see how your siblings can blame you for a camera that you didn't know was there. And how do they know they were not also filmed? I am assuming this was a shared bathroom. Regardless, this was not your fault and I am so sorry that your family is making you feel it is your fault. They are wrong.
If you can or when you can, please find yourself a therapist so you can heal from this. You can heal and you deserve to heal. ((Hugs))