Streaming form iMac to TV with Apple TV

Can I stream a video from my iMac to a TV in another room using Apple TV?

Will AirPlay work with iMac to TV?

You can AirPlay from a Mac to Apple TV box (or to AirPlay-enabled TV) through your home network. That includes all rooms where this home network is available.

In-app AirPlay is available from the Apple TV app, the iTunes application, QuickTime Player, or Safari. Other apps may be able to use AirPlay Screen Mirroring. Some services, content providers, or apps may block AirPlay and/or Screen Mirroring.

Stream audio and video from your Mac with AirPlay - Apple Support