It is much more a problem relatd to the console capability than to the programming language.
As far the console is ANSI compatible, the following code can be used:
<esc>[{attr1};...;{attrn}m
0 Reset all attributes
1 Bright
2 Dim
4 Underscore
5 Blink
7 Reverse
8 Hidden
Foreground Colours
30 Black
31 Red
32 Green
33 Yellow
34 Blue
35 Magenta
36 Cyan
37 White
Background Colours
40 Black
41 Red
42 Green
43 Yellow
44 Blue
45 Magenta
46 Cyan
47 White
So, blinking can be obtained by
cout << "\x1b[5m" << "TEXT" << "\x1b[0m"