Not likely going to be built in to these objects directly. These both
rotate the alpha channel already, leaving a zero in the alpha channel
in clear mode anywhere outside the transformed image. Simply feed to
jit.alphablend or jit.gl.videoplane @blend_enable 1.
Personally, I would composite on the GPU for maximum performance, but
if you need to stay on the CPU, jit.rota-> jit.alphablend should work
for your needs.