If your wifi tv has apps, you can stream your movies to your tv using the very popular and widely-used Plex app. See this videofor google for "plex + smart tv + mac" to read more about it.
If your TV does not support Plex app, you could stream your videos/content from your computer to your tv in other ways:
Chromecast:
Buy a chromecast dongle ($35) and stream movies from your mac to your tv using the chromecast plugin in the chrome browser. Not only that, you can also stream other content from your mac/smart phone/tablet/desktop with chromecast.
Roku:
You could buy a base model Roku ($49) and install Plex app on it and stream videos from your computer to your tv. You could also do a lot more with Roku too.
Apple TV:
Or you could buy Apple TV (starting $69) and stream your movies to your TV. Again Apple TV also offers a lot more than just streaming your content to the TV.