Wallpaper For Windows film. Fabulous stuff. Inexpensive. Just water to apply, nothing sticky. Can easily be removed or moved any time. I used it in our ensuite bathroom 16 years ago. It hasn’t budged

there is also shade cloth for greenhouses (sold in garden centers) that has different grades of shading. you can try getting the one that gets the most light thru. It'll prolly will act as a privacy curtain too. even the usual sheer curtains will fuzz up the camera focus. then there are venetian blinds: when camera is pointing down, if you reverse them down towards outside they will block the view from top but allow enough light in . same with vertical blinds: depending on camera angle you can position them sideways to cover the view in, but still get light from the other side. sun angle matters too, of course. but they allow the max light to come thru vertically.

This is commonly used on exterior windows where heat is an issue. I don't know much about it but I know that from my observation that I haven't been able to see inside during the day. You can get them motorized, too. Search Outdoor solar shades for windows or exterior shades for windows.

Have used film in 3 of our 4 bathrooms. It has lasted really well, 15 + yrs now, with no issues. We have paned windows, and I only used on the bottom 4 of 6 panes. First floor powder room window is set higher, and is pretty well blocked by a taller evergreen in the foundation planting. The other 2 are second story. All 3 have windows facing the street or driveway. You can only see a vague blur of a person at night, and the film is really not at all noticeable in daylight. Film comes in different designs, so the design may make a difference… we used an all over small crinkle design. You can buy a roll - and also need a window film applicator (liquid) - at Lowe’s or Home Depot. If a pane window, first cut a template to fit from cardboard to use in cutting the film. If you have access to a paper cutter, cutting is even easier. These are NOT adhesive-type films. The applicator liquid makes it easy to slide into place - just remember to take off the film’s backing before applying.