Use HTML
why? you will have more options
For mp4 video
disable autoplay:
<video src="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"controls></video>
enable autoplay:
<video src="http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4"controls autoplay></video>
For video site
you need to find out the embed iframe script from the website, then set autoplay=0 attribute on iframe
for your link:
<iframe src="https://player.bilibili.com/player.html?aid=908003820&bvid=BV1WM4y1d78x&cid=1042934418&page=1" scrolling="no" border="0" frameborder="no" framespacing="0" autoplay=0></iframe>