WebElement seekBar = getDriver().findElement(By.xpath(<elementXpath>));
int startX = seekBar.getLocation().getX();
int endX = seekBar.getSize().getWidth();
int yAxis = seekBar.getLocation().getY();
int end50X = (int) (startX + ((seekBar.getSize().getWidth()) * 0.51));
TouchAction action = new TouchAction(getDriver());
action.press(startX, yAxis).moveTo(end50X, yAxis).release().perform();