حدث onseeking

// Get the <video> element with id="myVideo"
var x = document.getElementById("myVideo");

// Attach a seeking event to the <video>, and execute a function if a seek operation begins
x.addEventListener("seeking", myFunction);

function myFunction() {
    // Display the current position of the video in a <p> element with id="demo"
    document.getElementById("demo").innerHTML = x.currentTime;
}