  The canonical quantization of $D=2n$ dimensional Dirac spinning particle in
the external electromagnetic field is carried out in the gauge which allows to
describe simultaneously particles and antiparticles (massive and massless)
already at the classical level. Pseudoclassical Foldy-Wouthuysen transformation
is used to obtain canonical (Newton-Wigner) coordinates and in terms of this
variables the theory is quantized. The connection of this quantization with the
Blount picture of Dirac particle in the external electromagnetic field is
discussed.
