Ask a landlord-tenant lawyer and get answers ASAP
I am sorry to hear this.
Your co-tenant has no right to exclude you from using the bathroom or kitchen when you need to. Your landlord said you both have the same rights, so you have the right to use the facilities when you wish, and your co-tenant can use the pause or stop button on the video camera if you are about to walk through a shot.
You can get a free consultation from some of the local landlord tenant attorneys listed here. My opinion is that the warranties of habitability and quiet enjoyment do apply to this rental, and I urge people never to take legal advice from their landlord.
I hope this information is helpful.