[kAn3]

In the video you provided, the

Код:

                 SendClientMessage(playerid, -1, "Nhan nut Spawn de bat dau cau chuyen!");

isn't executed. I am not sure this is the part of the code involved into the matter. Also this code

Код:

                 SetCameraBehindPlayer(playerid);
                 SendClientMessage(playerid, -1, "Nhan nut Spawn de bat dau cau chuyen!");
                 CancelSelectTextDraw(playerid);
                 SpawnPlayer(playerid);
                 SetPlayerPos(playerid, -2778.8638,-626.3374,504.9848);
                 SetPlayerFacingAngle( playerid, 270 );
                 SetPlayerCheckpoint(playerid, -2507.6191,-613.1049,132.5625, 3.0);

is a bit messed up, as you randomly spawn the player.
Plus, if you use SpawnPlayer the camera should be reset behind the player without using SetCameraBehindPlayer.