<view class="box">
<video></video>
<view class="bar">this is a bar</view>
</view>

.box{
  position:relative;
  transform-origin:0 50vw;
  transfrom:rotate(90deg);
}
.bar{
  position:absolute;
  bottom:0;
  left:0;
  z-index:1;
}

核心代码如上，问题是bar无法显示在video上