Yes! As long as you are not interfering with the Officer’s duties and/or investigation, there is no law prohibiting you from filming police in Canada.
If an officer asks you to stop filming or tries to take your recording device away, know that it is your constitutionally protected right to document any public activity in plain view and they cannot take your device or ask to see what you have documented without a warrant, or unless you are being arrested.
Record from a distance and stay out of the scene. If police are moving people away from a scene for safety or investigative purposes, you need to follow instructions. Failure to do so could lead to criminal charges for obstruct police, or worse could put you in a position of danger if it is a live and active scene.