Add autoplay option for videoLayer markers

[Mr-Kanister]

These changes make it possible to disable the automatic playback of videoLayers. If you do this via an event listener and pause(), often it still throws unnecessary AbortError errors due to the autoplay policies of modern browsers.

To be backwards compatible, it defaults to autoplay enabled.

Merge request checklist

• All lints and tests pass. If needed, new unit tests were added.
• If needed, the documentation has been updated.

[mistic100]

For some reason on my computer, removing video.play() makes the autoplay not working at all.

So I will add

                    if (video.autoplay) {
                        video.play();
                    }

[Mr-Kanister]

Sure, I was wondering why this call was there. Sorry I didn't ask.