While (as others have pointed out already) there is a hardwired LED next to the camera on all portable Macs, you can buy very thin, reusable camera cover sticke

While (as others have pointed out already) there is a hardwired LED next to the camera on all portable Macs, you can buy very thin, reusable camera cover stickers e.g. from the EFF: https://supporters.eff.org/shop/laptop-camera-cover-set-ii https://supporters.eff.org/shop/laptop-camera-cover-set-ii