Chameleon doesn't have full video support, as provided by the current version of jAlbum. Therefore, though it seems counterintuitive, you actually need to turn jAlbum's video support off - see Tools, Preferences, Album. Then make the album again.
Even then, the video will not be visible in any local preview. You need to upload the album to a server and view it from there. It appears to work in Edge and Firefox, but not in Chrome, which means that it's not really usable.
The video embedding method used in Chameleon is a technological dinosaur. If you want to include videos in your albums, it's time to leave Chameleon behind, and choose a more up-to-date skin. On the skins page, check the Plays video files box to see which skins include modern video support.