Save current frame of a video into an image

gistfile1.txt

function captureVideo(video) {
    var canvas = document.createElement("canvas");
    canvas.width = video.videoWidth;
    canvas.height = video.videoHeight;
    var canvasContext = canvas.getContext("2d");
    canvasContext.drawImage(video, 0, 0);
    const image = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream");
    window.location.href=image;
}