Iphone open device camera instead of web camera

[mkakadiya47]

Here is code, its now working properly on iphone, device open instead of web camera, anyone can help me?

Webcam.set({
width: 150,
height: 150,
dest_width: 640,
dest_height: 480,
image_format: 'jpeg',
jpeg_quality: 90,
});

Webcam.attach( '#my_camera' );
var shutter = new Audio();
shutter.autoplay = true;
function take_snapshot() {
    var take = $(".snap").data('val');
    shutter.src = '/public/assets/sounds/shutter.mp3';
    Webcam.snap( function(data_uri) {
        $(".image-tag").val(data_uri);
    });
    Webcam.freeze();
    $(".snap").html('');

    $("#exampleModalPreview").modal('toggle');
}

Webcam.on( 'error', function(err) {
    shutter.src = '/public/assets/sounds/error.mp3';
    shutter.play();
    $(".snap").data('val', "error");
});
Webcam.on( 'load', function(err) {
    $(".snap").data('val', "take");
});