Hi Shakil,
Apologize for the inconvenience. Our Video Gallery player can play only h.264 encoded video format which was mentioned in our feature. If your video does not meet the encoded format you will need to convert the videos.
The Original video URL https://demo.bkfoundation.co.in/wp-content/uploads/videogallery/23_video398137837.mp4 you have provided above does not play the videos in browser player (HTML5). Hence, this video will not be played in video gallery player (flash) and other embed players in the market.
We recommend you to convert the video using https://www.online-convert.com/ or handbrake and play the converted videos. This will fix the issue with the video.
If you are interested, we will help you convert all the video automatically with in the plugin using ffmpeg while uploading, so you don’t have to use third party encoders.