Deviced that can blur out people on my camera

Im not tech savy but are theor any electronic devices that can blur out someone trespassing on my property?We caught a gal but whem looking at wyzes cams she was blurred out and Pixelated so bad you couldnt make it out… wondering if shes been on our property many times before but we couldnt see her on Camera.

It could be possible if they have a wifi jammer on them that is causing your wifi speed to degrade and the camera auto-switches to low quality mode to compensate.