Home security cameras
You can install cameras on your own property pointing at your own land or entrances.
Cameras that capture your neighbour's private areas (backyard, bedroom windows) or public spaces beyond what is necessary may breach privacy expectations and could lead to complaints or civil claims.
Recording conversations
Section 184 of the Criminal Code prohibits intercepting a private communication, but there is a single-party consent exception: you can record a conversation you are part of.
Recording a private conversation you are not part of, without authorization, is a criminal offence.
Civil privacy torts (intrusion upon seclusion) may still apply to recordings that are legal under the Criminal Code.
Drones
Drones are regulated by Transport Canada. Privacy law also applies: drone footage of identifiable individuals can be personal information. The OPC has published guidance on drone use.
Dashcams
Dashcams pointed at the road are generally acceptable, but continuous audio recording inside the vehicle of passengers without notice can raise privacy concerns.