Adding Videos to Posts
There are several ways of adding videos to your posts:
Using an External Video Hosting Service
You can then use a plugin such as Video Plug plugin to embed your videos into a post.
Uploading Videos to your b2evolution Server
In this case, you upload your videos and attach them to your post just like you would do with images.
You will then need to install a video player plugin such as Flowplayer Plugin (Video) to display the video file in a player.