<div class="tab-img">
            <video id="autplay-video" width="320" height="240" controls autoplay
                poster="https://solax-prod.s3.amazonaws.com/demo/Thumbnail+English-SOLAx+Video.jpg">
                <!-- <source src="https://solax-prod.s3.amazonaws.com/demo/English+Demo+(Final).mp4" type="video/mp4" /> -->
                <source src="https://solax-prod.s3.amazonaws.com/demo/English+Demo+(Final).mp4" type="video/ogg" />
            </video>
            <button id="playButton" onclick="playonclick()" style="display: none;">Play Video</button>
        </div>

I tried the js and jQuery for unmuting the video , and also tryed the different event for that.