How to Use Video on Google+ Overview:
5. Once your video has completed its upload, press “Add Videos”.
6. Your movie will now appear in your feed.
Time to add a comment and share it with whichever Google+ Circle or people you want.
Optional: check the radio box provided to the left of “Also send email to Friends” to directly notify those you want to share it with.
Alternate Upload Method – If your Profile is newly created or upgraded, you may receive this message instead, when you try to add upload a movie file.
Just press “Upload new videos” (highlighted in green here) and follow the same steps as described from #2 onwards.