Snap Camera, you just install it, restart Zoom and select Snap Camera as your camera. There are tons of effects in there including a black and white one.
Lovely and thank you! Sorry about the mosquito bites. I just bought something called Bite Away, which actually works to stop the itching. It is pricey (about $39), but it worked magically. So happy to have found it. https://www.amazon.com/gp/product/B07Y3X5JDZ/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&th=1