During the day, yes. At night, no. When IR night vision activates in low light, the infrared LEDs reflect off the glass and bounce straight back into the lens. The result is a white-out image that is completely unusable. This is why mounting a camera behind a window is not a substitute for a proper outdoor installation.
This is one of the most common mistakes people make with DIY cameras. They place a camera on a windowsill or stick it to the glass with a suction mount, and it works fine during daylight. Then at night the image turns into a bright white glare and records nothing. Doberman sees this regularly when replacing failed DIY setups.
Some cameras offer an option to disable the IR LEDs, which removes the reflection problem. But then the camera has no night vision at all and relies entirely on ambient light - street lamps, porch lights, or nearby lighting. In most residential settings, this produces a dim, grainy image that is not useful for identification.
The proper solution is to mount the camera outside. Outdoor-rated PoE cameras are designed for exactly this. They are weatherproof, have built-in IR that works unobstructed, and with a wired connection they do not depend on Wi-Fi signal strength through the wall. Doberman runs the cable through the wall or soffit and mounts the camera externally so you get full 24-hour coverage.
There are rare cases where indoor mounting behind glass makes sense - for example, a camera covering an internal shop window display where the area is well-lit at night. But for general home security, if a camera is behind glass, it is not doing its job after dark.