核心API ：navigator.mediaDevices.getUserMedia&MediaRecorder

场景： 微信公众号H5

实现：Vue+TypeScript

代码：

以下仅为ts部分代码

// 开始录制
startRecord(e: any) {
	this.isRecording = true
	this.isBoxShow = false
	this.recorder.start()
	this.countDown(true)
}
// 结束录制
stopRecord() {
	this.isRecording = false;
	this.countDown(false)
	this.videoLength = this.takeTip
	this.isOperateShow = true;
	this.recorder.stop();
	this.stopTracks()
}
// 点击上传
uploadVideo() {
	let file = this.videoStream
	// console.log('file', file);
	this.sendFile(file);
	this.fileState = false;
	setTimeout(()=>{
		this.fileState = true
	},200)
}
// 上传文件
sendFile(file: any) {
	const token = getToken()
	let that = this
	let xhr = new XMLHttpRequest()
	let fromData = new FormData()
	const newfile = new File([this.file], 'audio/mp4');
	fromData.append('file',newfile, 'file.mp4')
	let loading = that.$weui.loading('正在上传中')
       xhr.onload = function () {
           if (xhr.status === 200 && xhr.status < 300 || xhr.status === 304) {
			loading.hide()
               try {
				const res = JSON.parse(xhr.responseText)
				console.log('上传文件结果', res)
				if (res.ActionResult === '1') {
					that.$weui.toast('上传成功')
					that.$router.push('/home')
				} else {
					that.$weui.toast(res.Message, toastQuery);
				}
               } catch(error) {
                   console.log(`errMsg:${error}`)
               }
           } else {
			loading.hide()
			console.log(`xhr.status:${xhr.status}`)
		}
       }
	xhr.open('post', url, true)
	xhr.setRequestHeader('Authorization', token)
	// xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded')
       xhr.send(fromData)
}
// 储存录像数据
saveRecordingData  () {
	let blob = new Blob(this.chunks, { 'type' : 'video/mp4' })
	console.log('视频大小', (blob.size/(1024*1024)).toFixed(2) + 'M');
	this.videoStream  = URL.createObjectURL(blob);
	this.file = blob;
	this.onCapture;
	this.chunks = [];
}
// 获取录像数据
getRecordingData (e: any) {
	this.chunks.push(e.data);
}
bindEvents () {
	this.recorder.ondataavailable = this.getRecordingData;
	this.recorder.onstop = this.saveRecordingData;
}
// 请求多媒体资源
requestAudioAccess () {
	const constrains = {audio: true, video: true}
	navigator.mediaDevices.getUserMedia({audio: true, video: true}).then(stream => {
		// var options = {
		// 	mimeType : 'video/mp4'
		// }
		this.recorder = new (window as any).MediaRecorder(stream);
		this.stream = stream;
		let video: any = this.$refs.video
		video.srcObject = this.stream
		video.muted = true
		video.play();
		this.bindEvents();
	}, error => {
		alert('出错，请确保已允许浏览器获取音视频权限');
	});
}
// 关闭摄像头
stopTracks() {
	console.log('stream', this.stream)
	if (this.stream) {
		this.stream.getTracks().forEach((item: any) => {
				item.stop()
		})
	} else {
		console.log('stream', this.stream)
	}
}
// 初始加载
mounted() {
	this.isBoxShow = true
	document.title = '视频授权'
	if (!navigator.mediaDevices) {
		alert('您的浏览器不支持获取用户设备');
           return;
	}
}

以上方式适合Android的方案，在iPhone机型上需使用input标签调用系统摄像头

参考博客1

input调用系统摄像头