<scroll-view class='scroll-video-box' scroll-y="true" scroll-x="true" bindtouchmove="touchmoveCallback" bindtouchstart="touchstartCallback">
<live-player id="livePlayer" binderror="error" bindstatechange="statechange" mode="RTC" src="{{isHD ? videoHDSrc :videoSrc}}" catchtap="onVideoTap" muted="{{!openSound}}" style="width:{{scaleWidth }}px;height:{{scaleHeight}}px" class="video-item" bindfullscreenchange="{{fullscreenChange}}" object-fit="{{objectFit}}">
</live-player>
</scroll-view>
想实现一个视频双指缩放功能，为什么视频全屏展示时 bindtouchmove、bindtouchstart无法触发？
请具体描述问题出现的流程，并提供能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。